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501 Your domain does not seem to be valid. Could not find MX record for your domain.
501 5.6.0 Data format error

Diagnostic-Code: SMTP; 501 Your domain does not seem to be valid. Could not find MX record for your domain.

Subject: Cron    [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete
Content-Type: text/plain; charset=ANSI_X3.4-1968
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=root>

the following error comes as mail every 30 min
please help
thanks in advance

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closed as not a real question by rnxrx, voretaq7 Oct 25 '12 at 21:54

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

It's difficult to tell exactly what you want fixed here. – Ladadadada Oct 25 '12 at 12:57

I see several potential problems here.

  1. The hostname of your server (webwerks-G31M-ES2L) is set to something other than a FQDN that you control.
  2. The FQDN of your server has no MX records.
  3. Your /etc/aliases file is forwarding emails somewhere invalid.
  4. You have a standard PHP cron job running every 30 minutes but you aren't running a PHP website.
  5. Your local mail server is configured to send mails that it shouldn't.
  6. Your local mail server is claiming to be webwerks-G31M-ES2L rather than a FQDN.

What you should do to start is put lines in /etc/aliases file to send root's mail to you.


After that, work through the rest of that list and check each one to see if it's true. You should find a file at /etc/mailname that tells Postfix what name to say it is when it talks to other mail servers. That will help with 6..

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