Brad Chandler:
> Aug 15 18:51:24 mx03 postfix/smtpd[13552]: fatal: watchdog timeout
> Aug 15 18:51:25 mx03 postfix/master[1553]: warning: process 
> /usr/libexec/postfix/smtpd pid 13552 exit status 1

That is a Postfix safety mechanism for a rare infrastructure bugs
that mess up Postfix event handling (typically, whether or not a
file descriptor is readable).

- What OS distribution is this?

- Is the system running on virtual hardware?

        Wietse

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