sendmail Name server timeout

Posted by broody on Server Fault See other posts from Server Fault or by broody
Published on 2012-09-26T23:05:11Z Indexed on 2012/09/27 3:39 UTC
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Complete sendmail newbie here... I've been trying to get mailing to work in PHP and I've root caused it down to sendmail's complaint about "Name server timeout":

>sendmail -t -v
>From: [email protected]
>To: [email protected]
>.
gmail.com: Name server timeout
[email protected]... Transient parse error -- message queued for future delivery
[email protected]... queued

So it sounds like a DNS issue? But I can do a "dig mx gmail.com" and it will query successfully.

Here's what confuses me... I can get sendmail to work two other ways. The first way is through telnet:

>telnet 127.0.0.1 25
>Helo me
>Mail from: [email protected]
>Rcpt to: [email protected]
>.
message sent

And the second way is by explicitly appending the sendmail.cf, but this is strange because it's the exact same file I use to configure sendmail to begin with:

>sendmail -t -v -C/etc/mail/sendmail.cf

But none of these solutions will resolve my PHP mailing... I am clueless as to what is going on... appreciate any help.

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