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• Can any postfix guru assist me determine how emails are still being sent via my server from unauthorized sources?

  - by Dave

  Hi all, I'm getting a little concerned as I run a small server hosting a number of websites and manage the email for a few dozen people. Just recently though I've had a couple of notifications from spamcop alerting me that spam has been sent from my server, and when I have a look over the logs from time to time I can indeed see that there are many repeated attempts of mail being sent from my server. Most of the time it gets knocked back from the destination servers but sometimes its getting through. Unfortunately I'm not linux or postfix expert, I can get by but had though I had my machine locked down quite securely, I don't allow relaying, when I check the online DNS/MX tools they tend to report my server as being OK so I'm not sure where to take it now and hoping someone might be able to throw me a few pointers. I get lots of entries like this in my MAIL.INFO log Jan 2 08:39:34 Debian-50-lenny-64-LAMP postfix/qmgr[15993]: 66B88257C12F: from=<>, size=3116, nrcpt=1 (queue active) Jan 2 08:39:34 Debian-50-lenny-64-LAMP postfix/qmgr[15993]: 614C2257C1BC: from=<[email protected]>, size=2490, nrcpt=3 (queue active) and Jan 7 16:09:37 Debian-50-lenny-64-LAMP postfix/error[6471]: 0A316257C204: to=<[email protected]>, relay=none, delay=384387, delays=384384/3/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host mx.fakemx.net[46.4.35.23] refused to talk to me: 421 mx.fakemx.net Service Unavailable) Jan 7 16:09:37 Debian-50-lenny-64-LAMP postfix/error[6470]: 5848C257C20D: to=<[email protected]>, relay=none, delay=384373, delays=384370/3/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host mx.fakemx.net[46.4.35.23] refused to talk to me: 421 mx.fakemx.net Service Unavailable) then there tends to be connection timeouts, so from what I see even though I had relaying disabled.. something is getting by and trying to send.. So if you can help that will be greatly appreciated, and any further logging/config info I can supply. Thanks

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• E-mail sent with postfix are marked as spam.

  - by unkown

  I am using gmail as my email provider, and I only have gmail servers for my mx records. I don't like the 500 message per day cap. To address this issue I would like to run postfix on my Linux machine to only send email, incoming port 25 blocked by my firewall. I can send email, however google marks all messages sent with postfix as SPAM. How do I make sure that people know email sent with postfix is valid?

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• Postfix Vacation.pl with local users

  - by Simiyu

  Hi, I am trying to setup the vacation.pl script on a mail servers which has local users only (since they are only 10 users). I have installed the SquirrelMail plugin and the Auto respond option is available for the users, but when an email is sent to the addresses no auto reply email is sent to the sender. There are also no logs on the /var/log/vacation folder which i created as well as the normal log files. Most of the examples online refer to virtual users, can it work with local users? and if so how? regards, Arthur

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• Rewriting to address on postfix local aliases

  - by Wade Williams

  I was running into the common problem that mail for "root" on my system was having $mydomain appended, and because $mydomain is not in $mydestination, the mail was being sent to our central mail server as "root@domain." I cannot add $mydomain to $mydestination, because if I understand it correctly, that would mean all mail addressed to $mydomain would be looked up locally, and if an alias does not exist, delivery would fail. So, I followed these instructions: Delivering some, but not all accounts locally which seems to have resolved the problem. Mail for "root" is now expanded according to /etc/aliases and delivered to the non-local address I desire. The one oddity however is that the "To:" address still reads "root@domain." Is there any way I can get the "To" address to be the one that the alias directed its delivery? So for example, if my alias says that mail for "root" should go to "hostname-admin@domain" is there any way the "To" address can be rewritten as "hostname-admin@domain?" Currently it still shows as "root@domain."

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• postfix and chdir domain.com/admin/ failed

  - by senzacionale

  root@ubuntu-server:/var/log# telnet localhost 110 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. +OK Hello there. user [email protected] +OK Password required. pass MyPasswd -ERR chdir domain.com/admin/ failed Connection closed by foreign host. and mail.log Apr 24 12:36:41 ubuntu-server pop3d: Connection, ip=[::ffff:127.0.0.1] Apr 24 12:36:58 ubuntu-server pop3d: chdir domain.com/admin/: No such file or directory what can i do? how to set up this directories? MX records are set, domain is set,...

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• Is it safe to run Postfix w/o securing it?

  - by Miko

  Does postfix need to be secured before it's safe to run it on a production server? I rely on Monit to notify me if certain processes are down or in trouble. For this purpose and this purpose only, I need postfix on the server so that Monit can send me email notifications. If it's necessary to secure Postfix before deploying it, what are some steps I can take to make it safer?

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• Defining Virtual and Real User Directories with Dovecot & Postfix

  - by blankabout

  Following a wobble described in this question we now have virtual and real users authenticating with Dovecot, the problem now is that the real users (who have been on the system for years) can no longer access their mail. I'm guessing that it is because Dovecot is configured to point to the virtual mailboxes but not the real mail boxes. These are snippets from the config files: /etc/dovecot/dovecot.conf !include conf.d/*.conf /etc/dovecot/conf.d/10-auth.cong passdb { driver = passwd-file # Path for passwd-file. Also set the default password scheme. args = scheme=cram-md5 /etc/cram-md5.pwd } userdb { driver=static #args = mail_uid=dovecot mail_gid=dovecot /etc/dovecot/userdb args = uid=vmail gid=vmail home=/var/spool/vhosts/%d/%n /etc/dovecot/userdb } [email protected]:::::/var/spool/vhosts/virtualdomain.com/:/bin/false:: We think the problem is that the Dovecot file 10-auth.conf does not contain a method of accessing the mailboxes for the real users. We have looked around on this site, dovecot.org and done the usual googling but cannot find anywhere that describes how to set up virtual users on alongside legacy real users. Any help would be appreciated, especially by our real users who would like the contents of their inboxes to be available! If any further config is required, please let me know.

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• Set origin for forwarder based on virtual domain in Postfix

  - by Andrew Koester

  I currently have a machine set up to operate with two domains. The main name uses the standard Unix-user delivery, and the second domain is entirely virtual (using virtual_alias_domains and virtual_alias_maps), with the second domain only forwarding mail. However, when mail is forwarded, it still appears to be delivered by the host of the primary domain (presumably set by myorigin.) Is it possible to get it so when mail is forwarded to the virtual domain, it appears to be delivered by it as well? That domain is on another IP and I'd like to use it so the mail stays consistent. Thanks.

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• VMware postfix server drops connection

  - by nicoX

  Our physical server godzilla forwards mails to our virtuall VMware server b4. They are on the same net. Often connection drops, we can't ping godzilla with our b4. That means mails from godzilla won't reach b4 and the mails will be in handed into the mailq. Sometimes it takes some hours and the issue will auto fix itself, b4 will wake up and the mail will be delivered. Another thing if we remotely ssh into the b4, the b4 will wake up and and receive any mailq mails from godzilla and deliver them. netadmin@b4:/var/log$ arp -a ? (192.168.209.80) at 00:1E:C9:AE:79:9D [ether] on eth0 root@godzilla:/usr/local/bin# arp -a ? (192.168.209.20) at 00:50:56:91:7d:b2 [ether] on eth0

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• E-mails sent with postfix are marked as spam.

  - by unkown

  I am using gmail as my email provider, and I only have gmail servers for my mx records. I don't like the 500 message per day cap. To address this issue I would like to run postfix on my Linux machine to only send email, port 25 blocked by my firewall. I can send email, however google marks all messages sent with postfix as SPAM. How do I make sure that people know email sent with postfix is valid?

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• Postfix: mail going to spam

  - by Yaro

  All emails I send from my new server go to spam in Gmail (and sometimes yahoo). I've never before sent out mass email or spam. What I've already done: Configured reverse DNS Enabled DKIM Verified my IP is not on spam lists Verified I'm not an open relay Here are the headers from the received message: http://pastie.org/pastes/8450781/text?key=onxgrau1xinyqv7ridxrea Really, can't seem to figure out why the mail just doesn't come through. I'd really appreciate your help. Thank you!

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• Postfix - searching emails (logstash, greylog or other solution)

  - by Yarik Dot

  We are currently having ~100 servers and all of them are using remote syslog, so we have aggregated all logs on one server. The most questioned problem from our support team is: Has an email from .... to ... been delivered? I'd like to give to our support team access to some logging tool and some guide for searching in logs. What would you have recommended me? Or, do you know any other alternatives to test? The problem of grepping logs is that there is not sender and recipient address on one line. So I supposed, there might by some aggregation by email id.

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• Is there a postfix mysql virtual_maps append_at_origin workaround so I can pipe to external scripts?

  - by FilmJ

  I am using virtual domains, and I'd like to setup the server to alias to custom scripts. I manage all accounts using postfix mappings to mysql. It seems that postfix automatically appends a virtual domain regardless of how the forwarded/aliased result comes back. So even though i have: "|/bin/command" postfix is reading it as: "|/bin/command"@mydomain.com Is there any work-around, or setting I can fix? It would seem than append_at_myorigin=no would be ideal, but that's unsupported according to the documentation. Another option, maybe I can skip virtual aliases altogether and use the "/etc/postfix/aliases" table - assuming all emails go to the main domain. I'll try this, but if anyone has any other ideas how to make it work with virtual domains, please let me know as this would be very useful! Thanks.

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• cyrus-imapd is not work with sasldb2, but postfix work

  - by Felix Chang

  centos6 64 bits: when i use pop3 for access cyrus-imapd: S: +OK li557-53 Cyrus POP3 v2.3.16-Fedora-RPM-2.3.16-6.el6_2.5 server ready <3176565056.1354071404@li557-53> C: USER [email protected] S: +OK Name is a valid mailbox C: PASS abcabc S: -ERR [AUTH] Invalid login C: QUIT and with USER "abc" failed too. my imapd.conf: configdirectory: /var/lib/imap partition-default: /var/spool/imap admins: cyrus sievedir: /var/lib/imap/sieve sendmail: /usr/sbin/sendmail hashimapspool: true sasl_pwcheck_method: auxprop sasl_mech_list: PLAIN LOGIN tls_cert_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem tls_key_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem tls_ca_file: /etc/pki/tls/certs/ca-bundle.crt allowplaintext: true #defaultdomain: myabc.com loginrealms: myabc.com sasldblistuser2: [email protected]: userPassword but my postfix is ok with same user. /etc/sasl2/smtpd.conf pwcheck_method: auxprop mech_list: plain login log_level:7 saslauthd_path:/var/run/saslauthd/mux /etc/postfix/main.cf queue_directory = /var/spool/postfix command_directory = /usr/sbin daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix mail_owner = postfix myhostname = localhost mydomain = myabc.com myorigin = $mydomain inet_interfaces = all inet_protocols = all mydestination = $myhostname, localhost.$mydomain, localhost,$mydomain local_recipient_maps = unknown_local_recipient_reject_code = 550 mynetworks_style = subnet mynetworks = 192.168.0.0/24, 127.0.0.0/8 relay_domains = $mydestination alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases home_mailbox = Maildir/ mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 sendmail_path = /usr/sbin/sendmail.postfix newaliases_path = /usr/bin/newaliases.postfix mailq_path = /usr/bin/mailq.postfix setgid_group = postdrop html_directory = no manpage_directory = /usr/share/man sample_directory = /usr/share/doc/postfix-2.6.6/samples readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_security_options = noanonymous smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_security_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination message_size_limit = 15728640 broken_sasl_auth_clients=yes please help.

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• configure postfix to send as different domains

  - by Cerales

  I have postfix configured to receive mail for multiple domains. The primary domain goes through a standard postfix setup, whereas a secondary domain is handed by a /etc/postfix/virtual.db file which maps addresses for the secondary domain to other unix users. Incoming mail works perfectly, but when I send mail as users on the secondary domain, the mail receiver still sees it as coming from [unix username]@[primarydomain].net. Can anyone help me figure out how to configure the virtual postfix domain to send mail through the same domain it receives it as?

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• Which is best Postfix Log analyzer?

  - by Anto Binish Kaspar

  Which is best Postfix Log analyzer? We are looking for good log analyzer for postfix. We need to analyze the following How many mails queued ? How many mails not delivered ? Why mails are not delivered ? And is it possible to view the subject for the all mail status instead of message id? I mean to review the status of the single mail. We are using Sawmill analyzer now. But the management is not satisfied with the report from the sawmaill, since its missing single message status and subject.

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• Postfix evaluation in C

  - by Andrewziac

  I’m taking a course in C and we have to make a program for the classic Postfix evaluation problem. Now, I’ve already completed this problem in java, so I know that we have to use a stack to push the numbers into, then pop them when we get an operator, I think I’m fine with all of that stuff. The problem I have been having is scanning the postfix expression in C. In java it was easier because you could use charAt and you could use the parseInt command. However, I’m not aware of any similar commands in C. So could anyone explain a method to read each value from a string in the form: 4 9 * 0 - = Where the equals is the signal of the end of the input. Any help would be greatly appreciated and thank you in advance :)

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• Postfix: How to apply header_checks only for specific Domains?

  - by Lukas

  Basically what I want to do is rewriting the From: Header, using header_checks, but only if the mail goes to a certain domain. The problem with header_check is, that I can't check for a combination of To: and From: Headers. Now I was wondering if it was possible to use the header_checks in combination with smtpd_restriction_classes or something similar. I've found a lot information about header_checks and multiple header fields, when searching the net. All of them basically telling me, that one can't combine two header for checking. But I didn't find any information if it was possible to only do a header check if a condition (eg. mail goes to example.com) was met. Edit: While doing some more Research I've found the following article which suggests to add a Service in postfix master.cf, use a transportmap to pass mails for the Domain to that service and have a separate header_check defined with -o. The thing is that I can't get it to work... What I did so far is adding the Service to the master.cf: example unix - - n - - smtpd -o header_checks=regexp:/etc/postfix/check_headers_example Adding the followin Line to the transportmap: example.com example: Last but not least I have two regexp-files for header checks, one for the newly added service, and one to redirect answers to the rewritten domain. check_headers_example: /From:(.*)@mydomain.ain>(.*)/ REPLACE From:[email protected]>$2 Obviously if someone answers, the mail would go to nirvana, so I have the following check_headers defined in the main postfix process: /To:(.*)<(.*)@mydomain.example.com>(.*)/ REDIRECT [email protected]$2 Somehow the Transport is ignored. Any help is appreciated. Edit 2: I'm still stuck... I did try the following: smtpd_restriction_classes = header_rewrite header_rewrite = regexp:/etc/postfix/rewrite_headers_domain smtpd_recipient_restrictions = (some checks) check_recipient_access hash:/etc/postfix/rewrite_table, (more checks) In the rewrite_table the following entries exist: /From:(.*)@mydomain.ain>(.*)/ REPLACE From:[email protected]>$2 All it gets me is a NOQUEUE: reject: 451 4.3.5 Server configuration error. I couldn't find any resources on how you would do that but some people saying it wasn't possible. Edit 3: The reason I asked this question was, that we have a customer (lets say customer.com) who uses some aliases that will forward mail to a domain, let's say example.com. The mailserver at example.com does not accept any mail from an external server that come from a sender @example.com. So all mails that are written from example.com to [email protected] will be rejected in the end. An exception on example.com's mailserver is not possible. We didn't really solve this problem, but will try to work around it by using lists (mailman) instead of aliases. This is not really nice though, nor a real solution. I'd appreciate all suggestions how this could be done in a proper way.

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• How to restrict postfix send limited email with policyd v2?

  - by Shalini Tripathi

  I have installed cluebringer-2.0.7 for postfix and enabled below lines in the main.cf file of postfix. But I could not see any policy working smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination check_policy_service inet:127.0.0.1:10031 smtpd_end_of_data_restrictions=check_policy_service inet:127.0.0.1:10031 To check further I enabled logging in policyd and its only shows below logs and there is no logs getting populated when I send new emails.. [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: Process Backgrounded [2012/06/12-21:18:50 - 13949] [CBPOLICYD] NOTICE: Policyd v2 / Cluebringer - v2.0.7 [2012/06/12-21:18:50 - 13949] [CBPOLICYD] NOTICE: Initializing system modules. [2012/06/12-21:18:50 - 13949] [CBPOLICYD] NOTICE: System modules initialized. [2012/06/12-21:18:50 - 13949] [CBPOLICYD] NOTICE: Module load started... [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: = AccessControl: enabled [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: = CheckHelo: enabled [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: = CheckSPF: enabled [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: = Greylisting: enabled [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: = Quotas: enabled [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: = Protocol(Postfix): enabled [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: = Protocol(Bizanga): enabled [2012/06/12-21:18:50 - 13949] [CBPOLICYD] NOTICE: Module load done. [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: 2012/06/12-21:18:50 cbp (type Net::Server::PreFork) starting! pid(13949) [2012/06/12-21:18:50 - 13949] [CORE] NOTICE: Binding to TCP port 10031 on host * [2012/06/12-21:18:50 - 13949] [CORE] WARNING: Group Not Defined. Defaulting to EGID '0 10 6 4 3 2 1 0' [2012/06/12-21:18:50 - 13949] [CORE] WARNING: User Not Defined. Defaulting to EUID '0' Do I need to do anymore settings for postfix to listen on policyd???Please help

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• libsasl2 change paths

  - by mk_89

  I have been following the tutorial https://help.ubuntu.com/community/Postfix for installing Postfix on ubuntu. Im stuck at the Authenication section of the tutorial where you change paths to live in the false root, if you look at the link above I have a file (/etc/default/saslauthd) which is pretty much the same as the one from the tutorial. saslauthd # This needs to be uncommented before saslauthd will be run automatically START=yes PWDIR="/var/spool/postfix/var/run/saslauthd" PARAMS="-m ${PWDIR}" PIDFILE="${PWDIR}/saslauthd.pid" # You must specify the authentication mechanisms you wish to use. # This defaults to "pam" for PAM support, but may also include # "shadow" or "sasldb", like this: # MECHANISMS="pam shadow" MECHANISMS="pam" # Other options (default: -c) # See the saslauthd man page for information about these options. # # Example for postfix users: "-c -m /var/spool/postfix/var/run/saslauthd" # Note: See /usr/share/doc/sasl2-bin/README.Debian #OPTIONS="-c" #make sure you set the options here otherwise it ignores params above and will not work OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd" When I run the following command in ubuntu dpkg-statoverride --force --update --add root sasl 755 /var/spool/postfix/var/run/saslauthd I get the following error dpkg-statoverride: warning: An override for '/var/spool/postfix/var/run/saslauthd' already exists, but --force specified so will be ignored. dpkg-statoverride: warning: --update given but /var/spool/postfix/var/run/saslauthd does not exist I don't why this is happening, I literally followed the tutorial step by step and have installed all the packages necessary, what could be the problem? do I have to manually create

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• How to prevent remote hosts from delivering mail to Postfix with spoofed From header?

  - by Hongli Lai

  I have a host, let's call it foo.com, on which I'm running Postfix on Debian. Postfix is currently configured to do these things: All mail with @foo.com as recipient is handled by this Postfix server. It forwards all such mail to my Gmail account. The firewall thus allows port 25. All mail with another domain as recipient is rejected. SPF records have been set up for the foo.com domain, saying that foo.com is the sole origin of all mail from @foo.com. Applications running on foo.com can connect to localhost:25 to deliver mail, with [email protected] as sender. However I recently noticed that some spammers are able to send spam to me while passing the SPF checks. Upon further inspection, it looks like they connect to my Postfix server and then say HELO bar.com MAIL FROM:<[email protected]> <---- this! RCPT TO:<[email protected]> DATA From: "Buy Viagra" <[email protected]> <--- and this! ... How do I prevent this? I only want applications running on localhost to be able to say MAIL FROM:<[email protected]>. Here's my current config (main.cf): https://gist.github.com/1283647

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• Nginx Ubuntu Postfix Config - Can't connect to incoming IMAP server 'server not responding' but can send mail via outgoing using same details?

  - by daveaspinall

  I'm pretty to new server admin and especially nginx but seem to be getting ok fine apart from accessing my mail via my iPhone? I've changed my domain to 'domain.com' The thing is I can send mail via my outgoing IMAP server but can't connect to the incoming one? I just get the message "the mail server at mail.domain.com is not responding" /etc/postfix/main.cf alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix home_mailbox = Maildir/ inet_interfaces = all inet_protocols = all mailbox_command = mailbox_size_limit = 0 mydestination = domain.com, mail.domain.com, localhost.com, , localhost, localhost.localdomain mydomain = domain.com myhostname = mail.domain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname recipient_delimiter = + relayhost = smtp_tls_note_starttls_offer = yes smtp_tls_security_level = may smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem smtpd_tls_auth_only = no smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt smtpd_tls_key_file = /etc/ssl/private/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom telnet localhost 25 ehlo locahost 250-mail.domain.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN Using the following details to connect: username password hostname: mail.domain.com port: 25 iptables --list Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination I also sent mail to the server as a test and got this missage if it helps? Technical details of temporary failure: [mail.domain.com. (10): Connection refused] I also looked in /var/log/mail.log and it has multiple entries of: postfix/smtpd[12239]: connect from 5acefc9a.bb.sky.com[90.206.252.xxx] Mar 23 06:47:09 new-domain postfix/smtpd[12239]: lost connection after CONNECT from 5acefc9a.bb.sky.com[90.206.252.154] Notice new-domain which is incorrect but the server hostname and hostname in the configs are correct? I recently moves servers and the host has set the primary domain on the service as new-domain.com so this may be the issue? Like I said, it works to connect to outgoing server, but incoming gets the not responding error? Any idea would be much appreciated!

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• How to get Postfix to send/forward/relay to a sub-domain located on another server?

  - by thiesdiggity

  I have a quick question. How do I setup postfix to send an email to another server (Exchange Server) when sending to an email address that has a sub-domain of our main server. For example, say our main server is mail.example.com and we have a Exchange server setup to receive emails from exchange.example.com. We have the MX records setup in our DNS and it receives correctly if we send from a GMail account. However, when we try to send an email from a @example.com account we get the following error: Host or domain name not found. Name service error for name=exchange.example.com type=A: Host not found I believe Postfix checks for local mailboxes first and if its setup with the domain it delivers to the local account, but in this case the sub-domain accounts are located in another server. Anyone have any thoughts on what I need to do within Postfix so it doesn't look locally for the exchange.example.com mailboxes? I found relay_domains directive within Postfix but that doesn't seem to fix it when I add the sub-domain. Thanks for your help.

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• User registration for postfix w/ mysql

  - by tacoen

  I would like to create a user registrations(using PHP) page for my postfix (w/ mysql), any one could lead me, how this can be done?

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• postfix check outgoing email headers

  - by Ke

  hi, ive set up postfix but unfortunately my emails get caught in hotmails junk/spam filter I would like to see the email headers before they are sent to hotmail. Is there any way i can do this on linux/ubuntu? Cheers Ke

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