Racker Hacker » sendmail http://rackerhacker.com Words of wisdom from a server administrator Wed, 25 Aug 2010 13:03:52 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 SquirrelMail: 127 Can't execute commandhttp://rackerhacker.com/2008/09/08/squirrelmail-127-cant-execute-command/ http://rackerhacker.com/2008/09/08/squirrelmail-127-cant-execute-command/#comments Mon, 08 Sep 2008 17:16:00 +0000 Major Hayden http://rackerhacker.com/?p=327 I found a Plesk 8.3 server running RHEL 4 last month that was presenting errors when users attempted to send e-mail via SquirrelMail:

ERROR:
Email delivery error
Server replied: 127 Can't execute command '/usr/sbin/sendmail -i -t -fsomeuser@somedomain.com'.

The error was appearing because safe_mode was enabled and SquirrelMail was unable to drop e-mails into /usr/sbin/squirrelmail. After disabling safe_mode on the server, the users were able to send e-mails via SquirrelMail.

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.]]> http://rackerhacker.com/2008/09/08/squirrelmail-127-cant-execute-command/feed/ 2 Basic procmail configuration with spamassassin filteringhttp://rackerhacker.com/2008/08/13/basic-procmail-configuration-with-spamassassin-filtering/ http://rackerhacker.com/2008/08/13/basic-procmail-configuration-with-spamassassin-filtering/#comments Wed, 13 Aug 2008 17:00:48 +0000 Major Hayden http://rackerhacker.com/?p=326 I've used this extremely basic procmail configuration a million times, and it's a great start for any server configuration. It passes e-mails through spamassassin (if they're smaller than 256KB) and then filters any e-mail marked as spam to /dev/null:

LOGFILE=/var/log/procmail.log
DROPPRIVS=yes

:0fw
| /usr/bin/spamc

:0
* ^X-Spam-Status: Yes
/dev/null

Of course, you can make this much more complicated with some additional customization.

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.]]> http://rackerhacker.com/2008/08/13/basic-procmail-configuration-with-spamassassin-filtering/feed/ 0 sendmail: savemail panichttp://rackerhacker.com/2008/02/18/sendmail-savemail-panic/ http://rackerhacker.com/2008/02/18/sendmail-savemail-panic/#comments Mon, 18 Feb 2008 18:56:37 +0000 Major Hayden http://rackerhacker.com/2008/02/18/sendmail-savemail-panic/ If you see a large mail queue and your system's I/O is increasing, you may find messages like these in your syslog:

Losing q5/qfg9N5EwE3004499: savemail panic
SYSERR(root): savemail: cannot save rejected email anywhere

In this situation, there's some reason why sendmail cannot deliver e-mail to the postmaster address. There's a few issues that can create this problem:

  • Missing postmaster alias in /etc/aliases
  • Hard disk is full
  • The mail spool for the postmaster has the wrong ownership
  • The mbox file for the postmaster is over 2GB and procmail can't deliver the e-mail

First, correct the situation that is preventing sendmail from delivering the e-mail to the postmaster user. Then, stop sendmail, clear the e-mail queue, and start sendmail again.

I found this issue on a Red Hat Enterprise Linux 4 server and then found the solution on Brandon's site.

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