Viktor Dukhovni:
> On Fri, Oct 18, 2013 at 03:15:49PM +0100, Mark Berry wrote:
>
> > However at other times they can take 30 minutes or more to all go.
>
> Slow cleanup(8) processing or disk I/O contention. Another
> possibility is a syslog daemon configured to do synchronous writes
> for every log entry (stresses the disk and slows down syslog clients
> such as pickup).
>
> Look for excessive header/body checks, or overly verbose logging.
Postfix uses one single pickup daemon process for all local submissions.
Thus, if your cleanup daemon is slow (for example due to excessive
header or body checks) then that will slow down all local submissions.
As Victor notes, use parallel SMTP submission if you need speed.
Wietse
