mailer prog died with signal 213

Hi,

Sendmail, our MTA, is logging to syslog "mailer prog died with signal
213," and my current theory is that it has something to do with procmail,
which a handful of people (including myself) are using as a filter.

Does anyone know what the error message means or if there's a file
that lists the meanings of the various errors?

I saw a message in this list's archives about this error a week
or so ago, but haven't seen a response.

Thanks,
Omar
omar(_at_)athena(_dot_)inch(_dot_)com