294 messages failing pipe: cat exim_mainlog | grep pipe\ delivery\ process | wc -l

[KatieBuller]

294 messages failing pipe:
cat /var/log/exim_mainlog | grep pipe\ delivery\ process | wc -l
294

Why are so many message failing a the pipe?

 

[chirpy]

It's impossible to say without you quoting the full pipe error message from the logs and showing us what the pipe command is that you're using in the Filter in question.

 

[webignition]

The most common cause I've experienced for piped mail failing is when a filter is set to pipe mail to a script (PHP or Perl) and the script to which the mail is piped fails to run correctly: either failing completely due to insufficient permissions or a syntax error when executing.

You'd most certainly get mail piping errors if you tried to pipe mail to something that doesn't exist - an incorrect path to a script or an invalid email address.