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Mail server problem
sending but not receivign email.

WebmasterWorld Administrator mack us a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

Msg#: 1515 posted 6:33 am on Aug 1, 2005 (gmt 0)

I set up a linux box to act as a mail server.

I created a virtual domain on the server mail.example.com and installed squirrel at that location. The install went fine and the app is performing as expected.

If I create a new message i can send it no problem, when th eemail arrives at it's location the return email address is normal me@example.com

when the mail is replied to, or a new mail is created the mail is never received at my server, but it doesnt bounce either.

I used dms to point mail.uxample.com to my ip using an mx record. I also used an a record for the actual subdomain mail.example.com

what else shoudl I be looking into?




WebmasterWorld Senior Member 10+ Year Member

Msg#: 1515 posted 7:01 pm on Aug 1, 2005 (gmt 0)

Does /var/log/maillog hold any clues?

I've often debugged mail problems by opening a "tail -f /var/log/maillog" and then sending email to watch what happens in real time.

Another option is to see what response your server gives to your incoming mail for yourself by opening a telnet session to your SMTP server and typing the commands manually...

telnet mail.example.com 25

Then type:

HELO mail.example.org <return>
MAIL FROM: someone@example.org <return>
RCPT TO: you@example.com <return>

...at this point your mail server should respond that it is prepared to accept mail for you@yourdomain.com, otherwise it should give a reason why not (user unknown etc.).


WebmasterWorld Senior Member 10+ Year Member

Msg#: 1515 posted 11:52 pm on Aug 6, 2005 (gmt 0)

Could you have port 25 (SMTP) blocked by a firewall?


10+ Year Member

Msg#: 1515 posted 3:57 am on Aug 31, 2005 (gmt 0)

Yeah, two basic troubleshooting tips.

1. Do as was listed above, connect FROM THE OUTSIDE WORLD to your mail server on port 25 and try and send yourself a message manually.

2. From a machine on the outside world, get to a command prompt and use:

set type=MX
example.com. (Use the domain after @ in the email address)
mail.example.com. (lookup any domain name redirects you get)

and see if it returns the right IP address.

If #2 fails, it's a DNS problem. If #1 fails with a timeout, it's likely a firewall issue, if #1 fails with connection refused, it's your server's mail accepting software's listening configuration. If #1 fails with a valid connection, but a refusal to deliver, your mail software may not be configured correctly to accept mail for that domain.

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