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> Oct 1 12:12:12 host sendmail [78]: PAA00353: SYSERR(root): mailer prog > died with signal 13 > ----------- > > In sendmail's documentation I don't find nothing related, and sendmail You wouldn't expect to; the error is self explanatory as far as sendmail is concerned, and it has told you all it knows. At the very least, we need to know your operating system, but even better would be to know what signal 13 is. (On Linux, it is SIGPIPE, which means that a write to a pipe failed because a downstream reader closed it prematurely. It is also SIGPIPE on SCO Unix, so it is probably fairly standard.) Generally sendmail will include error output from the failing program in the bounce message, if delivery is deferred, or on the terminal if delivery is immediate. That is probably where the real diagnostic will be.