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• SSH tunneling and NAT

  - by thonixx

  I have a virtual machine with an internal IP address and a running mailserver with IMAP/POP3/SMTP. Everything works fine except: When I do an SSH tunnel to the guest server and want to connect to the mailserver with mail.*. then it does not work. There is a connection timeout. But If i connect to the internal IP 192.168..* then it works. So what can I do to enable the access from the domain name to the virtual machine with SSH tunneling?

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• Accessing resources on localhost using domain credentials

  - by jas

  I'm trying to set up Team Foundation Server 2010, Sharepoint Server 2010 and Report Server 2008R2. I apologize for how long my question/problem is but I'm really lost on where to even look so am being as descriptive as possible in hopes that I'm making sense. The goal: Since developers can be inside or outside the firewall there needs to be a single http point of entry to TFS that works regardless of which side of the firewall you are and needs to work with external access to SharePoint and Report Server. Meaning we have it set up in DNS so buildserver.mydomain.com: points to the build service box which contains all of the services listed at the top of this post and specific services are defined/located by the port number. This is working great on every machine inside and out except for from the build server itself. All services must be able to work using external URLs. If I use http:// buildserver.mydomain.com:4800/tfs (the external URL) from my notebook which is behind the firewall I'm able to login with my domain credentials as expected. If the other developer points to the same URL from their home which isn't on the domain they are also able to login using their domain credentials. However if I am directly on buildserver and call SharePoint, TFS or Reporting Server from (i.e. http:// buildserver.mydomain.com:4800) itself using the external URL, I am prompted for a username and password. Entering my domain credentials results in another prompt to enter my credentials again. It will prompt three times regardless of which credentials are used (I have rights as a domain admin) and then after the third prompt directs me to a blank white page as though access was denied. There are no errors displayed on the page and nothing ends up in the event viewer. From buildserver if i use just the host name (the internal URL), then I'm prompted a single time for credentials and it works. i.e. http:// buildserver:4800/tfs works from the server itself. The behavior is identical for any service requiring authentication. Meaning from the box itself Sharepoint Central Admin, SharePoint WebApp, TFS, TFS Web Access, Report Server and Report Manager all fail using the external URL but will succeed if called using the interal URL. So the problem comes into play when configuring all of the services to work together. The only way to configure TFS is locally from the server which means I must point to the internal reporting server url (http:// buildserver:4800/reports and reportServer respectively instead of http:// buildserver.domainname.com:4800 like they need to be) since external URLs aren't working from itself. If I configure TFS to use the internal URL for Report Server then creating team projects or working in the SharePoint site for the team project fails for anyone not inside the domain since their machines have no idea who http:// buildserver:/reports even is or how to resolve them. I have configured Sharepoint with Alternate Access Mappings as well as set up Report Server to listen for external URLs. The external URLs simply aren't working when called from the server itself. I hope this makes sense. Thanks for taking the time to read this rather verbose plea for help.

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• network topology including many services

  - by mete

  I know this is yet another question on how to setup network but I hope you are not bored of such questions yet. The site is also an office, so it includes windows dc, windows ad, exchange, sql, file sharing, development app servers and other pcs. In addition to office (internal) things, there are both test and prod environments consisting of a web server-app server-sql stack. There is also ftp service open to public. I consider: dmz1 - web server - exchange edge - ftp dmz2 - app server - sql for app server internal - dc and ad - exchange hub and transport - internal file sharing - sql for internal use - app servers for internal use - pcs public - dmz1, only web, ftp and smtp public - dmz2 not possible public - internal not possible dmz1 - dmz2 is possible from web servers to app servers by using http or ajp dmz1 - internal is only possible for exchange, otherwise not possible dmz2 - internal not possible Does this sound ok ? Any other recommendations ? It will be configured using either MS ISA or Jupiter SSG. Thank you.

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• What tangible security are gained by blocking all but a few outgoing ports in a firewall

  - by Frankie Dintino

  Our current hardware firewall allows for blocking incoming and outgoing ports. We have two possibilities: Block certain troublesome ports (unsecured smtp, bittorrent, etc.) Block all but a few approved ports (http, https, ssh, imap-ssl, etc.) I see several downsides with option 2. Occasionally web servers are hosted on non-standard ports and we would have to deal with the resulting issues. Also, there is nothing preventing a malicious or unwanted service from being hosted on port 80, for instance. What are are the upsides?

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• SSL issue with emails

  - by JackWillDavis

  OK, so I have somebody hosting a site on my CentOS 5.8 Plesk 11 control panel. He has a EV SSL which is validating the site fine however he has failed the PCI check because it is saying his email servers (SMTP, IPAM, POP) have the wrong name on the servers. This is because his SSL certificate is not a wildcard certificate and the email servers are flagging the default Plesk SSL certificate. Is there a way to stop Plesk automatically connecting emails via the default SSL? I'm fairly new to things like this so I hope I've written everything I need, let me know if any more details are needed. Jack

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• Why my dns server ip got blacklisted instead of my email server ip?

  - by Khurram Masood

  We are hosting our own dns server our scenario is as under; dns ip: a.b.c.1 fqdn:ns1.example.com ------ reverse lookup to a.b.c.1 mail server ip a.b.c.2 mail.example.com ------ reverse lookup to a.b.c.2 smtp.example.com ------ no reverse lookup pop.example.com ------ no reverse lookup web server ip a.b.c.3 example.com ------ reverse lookup to a.b.c.3 www.example.com ------ no reverse lookup a few days back our dns server ip got blacklisted and all our services were down from outside. We had also added a new dns server on a separate network that caused our domain and machines with same names as above to resolve on different ips, can this b a cause of being blacklisted? But all blacklists points towards spamming. Can anyone please explain why my dns ip got blacklisted instead of my email or web server ip?

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• How to set up Windows server 2008 to receive email?

  - by Saul

  First off apologies, I'm from a medical background not a networking one, but I've got roped into setting up a windows 2008 server. So far web server running, fixed IP address assigned (within a large private network of the National Health Service in the UK if that makes any difference) and the network team have assigned a DNS entry for me which works, so the server can be addressed as nww.myserver.nhs.uk I've only got ports open on the router for 80 and 443 (http and https) at the moment, so presume I need a different port to enable email services. My need is to be able to accept an email to the domain name like [email protected] in order to pick up a confirmation mail from an SSL issuer (Comodo) I guess to confirm that I control the domain. After that I don't actually need mail services on the server. I see lots of stuff about setting up SMTP services but thought that was about mail out and re-routing, but how do you get the server to "listen" for mail to the domain (assuming I open port xyz or whatever it is) ?

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• Testing php mail() in localhost problem

  - by Samir Ghobril

  Hey guys, recently I just installed msmtp in linux and I even send a mail from the terminal and it worked: echo -e "Subject: Test Mail\r\n\r\nThis is a test mail" |msmtp --debug --from=default -t [email protected] But in php, after editing the php.ini file to have this: sendmail_path = '/usr/bin/msmtp -t' and using this piece of code: <?php if ( mail ( '[email protected]', 'Test mail from localhost', 'Working Fine.' ) ){ echo 'Mail sent'; } else{ echo 'Error. Please check error log.'; } ?> I get the Mail sent message but don't receive a message in my inbox. Not even in the spam folder. Anything wrong I'm doing? msmtp configuration file: defaults tls on tls_starttls on tls_trust_file /etc/ssl/certs/ca-certificates.crt account default host smtp.gmail.com port 587 auth on user [email protected] password password from [email protected] logfile /var/log/msmtp.log

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• How can I get the real Emailaddress of a recipient?

  - by Boas Enkler

  a user in out Company has 2 mail-addresses on one Exchange-Mailbox. e.g test@... and test1@... the Primary SMTP-address off the Mailbox is test@. If I send a message to test1@, load it using EWS and parse through the TORecipients-Collection there is exactly one emailadress. But the mailaddress EWS gives to me is test@... and not test1@... where I sent the mail. My problem is, that all mails sent to test@ should be imported in our CRM using my program. All mails sent to test1@... must not be imported. In real life both mailaddresses are from my Boss. One is used for normal purposes the other one is for confidential e.g. from his lawyer. Does anyone know how I can get the real-emailaddress the message was sent to?

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• Exchange 2013 - DNS Records for Accepting Multiple Domains

  - by William

  I have an Exchange 2013 server accepting two domains: domain1.com and domain2.com. All of the exchange services (OWA, ECP, POP3, SMTP, etc.) can be found via the address mail.domain1.com. So, in the DNS records for domain1, I have the following entries: MX Record mail.domain1.com A Record mail.domain1.com - (IP Address of Server) CNAME Record autodiscover.domain1.com - mail.domain1.com Now, for domain2.com, how would I set up the DNS records? Would I have the autodiscover just be a cname for autodiscover.domain1.com? Would this allow me to leverage the certificates that I have installed for domain1?

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• Microsoft Forefront Management Gateway 2010 - Which topology to choose for monitoring only server?

  - by MadBoy

  Hello, I've installed Forefront and wanted to use it as monitoring traffic solution until we decide to put it as a router. I've 2 nic's assigned to this virtual machine. One NIC has connected port which is "mirror port" of our WAN redirected on switch so it sees all the network traffic flying by. The other NIC is internet access. This server is located inside our lan network. What topology should i choose and which options I should look at to be able to see which traffic is used (SMTP, WWW etc) and who does what? We had cases of infected machines with spam and we want to be able to see that some machine is sending large amounts of mails. Is that possible ?

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• Configure postfix to filter email into hold queue

  - by Ian

  Hey, I would like postfix to send all emails received on SMTP off to an external process, which will decide whether to allow them through as normal, or whether to put them into the hold queue (or another quarantine area), where they have to wait for admin approval. I was thinking of doing this with an after-queue content filter, which uses pipe(8) to run a script on each message, and the script itself will spawn "postsuper -h " if it decides to put the message on hold. Then the admin can do postsuper -d or -r to delete or pass the message on as appropriate. So, my questions are - a) will this work, and b) is this the best way to do it? Would a milter or another type of content filter be a better approach?

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• ScriptAlias makes requests match too many Location blocks. What is going on?

  - by brain99

  We wish to restrict access on our development server to those users who have a valid SSL Client certificate. We are running Apache 2.2.16 on Debian 6. However, for some sections (mainly git-http, setup with gitolite on https://my.server/git/) we need an exception since many git clients don't support SSL client certificates. I have succeeded in requiring client cert authentication for the server, and in adding exceptions for some locations. However, it seems this does not work for git. The current setup is as follows: SSLCACertificateFile ssl-certs/client-ca-certs.crt <Location /> SSLVerifyClient require SSLVerifyDepth 2 </Location> # this works <Location /foo> SSLVerifyClient none </Location> # this does not <Location /git> SSLVerifyClient none </Location> I have also tried an alternative solution, with the same results: # require authentication everywhere except /git and /foo <LocationMatch "^/(?!git|foo)"> SSLVerifyClient require SSLVerifyDepth 2 </LocationMatch> In both these cases, a user without client certificate can perfectly access my.server/foo/, but not my.server/git/ (access is refused because no valid client certificate is given). If I disable SSL client certificate authentication completely, my.server/git/ works ok. The ScriptAlias problem Gitolite is setup using the ScriptAlias directive. I have found that the problem occurs with any similar ScriptAlias: # Gitolite ScriptAlias /git/ /path/to/gitolite-shell/ ScriptAlias /gitmob/ /path/to/gitolite-shell/ # My test ScriptAlias /test/ /path/to/test/script/ Note that /path/to/test/script is a file, not a directory, the same goes for /path/to/gitolite-shell/ My test script simply prints out the environment, super simple: #!/usr/bin/perl print "Content-type:text/plain\n\n"; print "TEST\n"; @keys = sort(keys %ENV); foreach (@keys) { print "$_ => $ENV{$_}\n"; } It seems that if I go to https://my.server/test/someLocation, that any SSLVerifyClient directives are being applied which are in Location blocks that match /test/someLocation or just /someLocation. If I have the following config: <LocationMatch "^/f"> SSLVerifyClient require SSLVerifyDepth 2 </LocationMatch> Then, the following URL requires a client certificate: https://my.server/test/foo. However, the following URL does not: https://my.server/test/somethingElse/foo Note that this only seems to apply for SSL configuration. The following has no effect whatsoever on https://my.server/test/foo: <LocationMatch "^/f"> Order allow,deny Deny from all </LocationMatch> However, it does block access to https://my.server/foo. This presents a major problem for cases where I have some project running at https://my.server/project (which has to require SSL client certificate authorization), and there is a git repository for that project at https://my.server/git/project which cannot require a SSL client certificate. Since the /git/project URL also gets matched agains /project Location blocks, such a configuration seems impossible given my current findings. Question: Why is this happening, and how do I solve my problem? In the end, I want to require SSL Client certificate authorization for the whole server except for /git and /someLocation, with as minimal configuration as possible (so I don't have to modify the configuration each time something new is deployed or a new git repository is added). Note: I rewrote my question (instead of just adding more updates at the bottom) to take into account my new findings and hopefully make this more clear.

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• Domino 8.5.3: Modify Subject of Incoming Email

  - by Void

  I am a newbie in managing and development for Domino. Recently, I have request from other teams at work to set up a filter or agent for incoming mail. This is the requirement for the request: Look for Incoming Mail addressed to #CRITICAL (mutlipurpose, internal group containing a list of engineers) For mail matching Point 1, append "For Immediate Action: " to the front of the Subject Some restrictions I have: Only the Domino server is under my charge, not to touch on network-side or other servers No 3rd party software to be installed I have gone through the configurations in the Domino server and the closest thing I have to filtering Email is the Router/SMTP Restrictions... Rules. But this is not able to fulfill Point 2 in any way. Is this even possible using just Domino server settings, or through agents?

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• sSMTP Configuration Question

  - by SevenCentral

  I've installed sSMTP on Ubuntu 10.04 via: sudo apt-get install ssmtp My configuration file is: # # Config file for sSMTP sendmail # # The person who gets all mail for userids < 1000 # Make this empty to disable rewriting. [email protected] # The place where the mail goes. The actual machine name is required no # MX records are consulted. Commonly mailhosts are named mail.domain.com mailhub=smtp.gmail.com:587 # Where will the mail seem to come from? #rewriteDomain= # The full hostname hostname=somedomain.com # Are users allowed to set their own From: address? # YES - Allow the user to specify their own From: address # NO - Use the system generated From: address #FromLineOverride=YES [email protected] authpass=**** usestarttls=yes Am I transmitting my credentials in clear text? Is calling ssmtp a secure operation? Thanks.

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• mailman not relaying email to external address

  - by gozzilli

  I have a setup of mailman with postfix on an ubuntu server 12.04. My problem is that mailing list emails are not forwarded to email addresses external to my institution. However the initial welcome email is received by everyone, internally and externally. in fact, a simple email from command line with mail is successfully sent to anyone after that, mailing list emails are only forwarded to internal addresses. the domain name I'm using for the server is not that of my institution who is hosting the server. Here is my main.cf: myorigin = sub.myinstitution.tld mynetworks = 127.0.0.0/8 xxx.xxx.xxx.xxx/16 # this is my institution ip range relayhost = smtp.myinstitution.tld inet_interfaces = loopback-only local_transport = error:local delivery is disabled virtual_alias_maps = hash:/etc/postfix/virtual smtpd_recipient_restrictions = permit_mynetworks myhostname = mywebsite.tld mydestination = $myhostname, localhost.$mydomain, localhost I also found these two links on serverfault and ubuntu forums, but neither of these solutions seem to do the trick for me. Any help would be much appreciated.

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• Need to set mailx variable to specify the From address

  - by user256817

  Running Oracle Linux 5.8 (which is just re-branded RedHat EL 5.8) I must change the From address. But we have scripts that use mailx which cannot be re-written to use any extra flags, so I'd like to use internal variables instead, which I see on the linux.die.net manpage on mailx is an alternative to the -r flag: -r address Sets the From address. Overrides any from variable specified in environment or startup files. Tilde escapes are disabled. The -r address options are passed to the mail transfer agent unless SMTP is used. This option exists for compatibility only; it is recommended to set the from variable directly instead. (Source: http://linux.die.net/man/1/mailx) How can we use these mailx variables? I tried adding this to /root/.mailrc, no go: set [email protected] I also added that to /etc/mail.rc with no gold. So I am turning to you, SuperUsers...

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• How to add exception for backup MX to tumgreyspf?

  - by Waleed Hamra

  I have an Ubuntu raring server running postfix/dovecot as an email server, with tumgreyspf doing greylisting and SPF checks. My problem is that I also have a backup MX server, that is supposed to store my emails temporarily, should my main server ever fails. It usually rejects receiving emails if it finds the main server online and functional. The problem is when it does need to do its job, tumgreyspf rejects all emails from the backup MX with an error like this: Jun 27 16:18:13 hamra postfix/smtpd[28732]: NOQUEUE: reject: RCPT from mxbackup.mydomain.com[x.x.x.x]: 550 5.7.1 <[email protected]>: Recipient address rejected: QUEUE_ID="" SPF Reports: 'SPF fail - not authorized'; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<mxbackup.mydomain.com> any ideas?

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• failed to use mutt to send mail to company mailbox

  - by Acewind

  I'm using mutt&postfix on CentOS 6.2: mutt-1.5.20-2.20091214hg736b6a.el6_1.1.x86_64 postfix-2.6.6-2.2.el6_1.x86_64 When I try to send mail to my company mailbox, I receive an error: mutt -s "test" [email protected] < /home/mail.txt error from postfix: : host out1.ourcompany.com[10.30.17.100] said: 555 Syntax error (in reply to MAIL FROM command) Then I try to use service sendmail as SMTP server, but also failed: **----- The following addresses had permanent fatal errors ----- (reason: 555 Syntax error) ----- Transcript of session follows ----- ... while talking to out1.ourcompany.com.: MAIL From: SIZE=667 <<< 555 Syntax error 554 5.0.0 Service unavailable** Any body can tell me why? Thanks!!!! I can make sure DNS is OK, and I set realname "root@myserver" in /etc/Muttrc

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• "Brute force attempt" on sending multiple emails

  - by bretddog

  While testing to send multiple emails, I successfully sent about 100 emails (with a 20KB pdf attachment), to the same email-address (my own), and they were all received. But on next attempt, my cPanel account was blocked, due to a "brute force attempt". Are there any special precautions I need to take when sending bulk emails? I simply looped through below code without pause for each email. What type of alert could that give on the email server, and how should I avoid it? client = New SmtpClient(smtp, Convert.ToInt32(port)) AddHandler client.SendCompleted, AddressOf OnAsyncSendComplete client.Credentials = New System.Net.NetworkCredential(usn, psw) client.SendAsync(mail, token) Should I wait for SendComplete event for each email before sending the next?

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• How to integrate Thunderbird with SpamAssassin running on the server?

  - by haimg

  I'm trying to integrate SpamAssassin running on a server with Thunderbird. Basically I need to be able to select several emails in Thunderbird and send them back to SpamAssassin for training, either as spam or ham. I tried several approaches: Tried "Report Spam" plugin, which is able to send message back to server either as an email attachment or via HTTP post. However, the plugin is rather buggy... Does not support sending several messages at once, "report as ham" is not working at all, etc. Wanted to make a custom button that will copy selected messages to a separate IMAP folder (I could create "LearnAsSpam" and "LearnAsHam" folders in IMAP that will get processed automatically on server), but don't even know how to approach this in Thunderbird, don't want to learn Thunderbird extention authoring... Server-side, I'm prepared to do some custom programming or integration needed (can receive a message via HTTP / SMTP / whatever), my stumbling block is Thunderbird... So, how can I send emails from Thunderbird back to SpamAssassin running on email server for Bayesian training, with as few keystrokes as possible?

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• Two mail servers, need help with dns configuration for the backup one

  - by user92231

  I need to run a redundant backup mail server in case the main one goes down. The settings in GoDaddy look something like the following: A (Host) Host Points to @ ip address of mail1 41.x.x.x mail1 ip address of mail1 41.x.x.x mail2 ip address of mail2 196.x.x.x MX Priority host points to 10 @ mail1.mydomain.com 20 @ mail2.mydomain.com When mail1 goes down, mail2 is able to get emails. I can access it through the browser with no problem, but I want my users to able to pop3/smtp as well without changing anything in their outlook. I dont want any impact to the users when mail1 is down. Also, I'm using the windows server DFS to keep both folders of the mails in sync. Is this the right way, or should I be using something else?

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• Configure Postfix to use external MX servers for delivery of local mail if user is unknown

  - by mr.b

  I have a following setup: linux box with postfix configured to be responsible for example.com domain domain's MX servers are configured so that mail sent to example.com is sent to google mail servers several user accounts on linux machine exist (same machine also hosts example.com site) When someone from the outside attempts to send mail to address ending with @example.com, it gets routed to google mail (and there handled appropriately). When linux machine tries to send mail to outside world, mail is delivered correctly, as reverse dns and spf records are configured correctly, so linux machine is valid mail sender for example.com domain (along with google mail servers). However, here's the problem. When php application (hosted at linux box) tries to send mail to [email protected] (and someuser doesn't exist on linux box), it fails, since it doesn't even consult google mail servers, but postfix smtp locally concludes that "someuser" is unknown. So, the question is: how do I tell postfix to relay mails sent to @example.com domain to google mail servers (so, to servers specified in MX records), IF and only if a mailbox is not found locally.

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• Conditionnal relay in postfix

  - by Florent

  I use postfix to send direct email. But, I use a relay to send email for specific senders. So I use "sender_dependent_relayhost_maps" : /etc/postfix/main.cf : relayhost = transport_maps = hash:/etc/postfix/transport smtp_sender_dependent_authentication = yes sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay /etc/postfix/sender_relay : [email protected] smtp.relay.com So when I send an email with sender email "[email protected]", postfix will use the relay. But... I don't want to use the relay host for some recipient. ;) I think I must use "transport_map" to catch the email before it pass through "sender_dependent_relayhost_maps" but I don't know how to do it... Thanks

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• Security measures for CentOS

  - by cappuccinodrinker

  I have been tightening up my web server security and wanted to know what else I can do. I am running CentOS 5 with these measures: - All passwords to FTP, MySQL etc are generated from grc.com/passwords.htm and microsoft.com/protect/fraud/passwords/create.aspx (for the ones which cannot be too long). - Running iptables with all ports shut off except for http mail and smtp, the important ports like FTP SSH are blocked to all except my static office IP. There is also no response to pings. - Rootkit Hunter running daily - The server is PCI compliant according to Comodo - Not running any crappy made php apps, we use Zend Framework for our stuff and do have kayako installed and keep them up to date. Can't really think of anything else I can do... I could implement a brute force measure, but I think I already have by simply changing my SSH port to a number above 10000 and blocking it off with iptables.

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