On Fri, 21 Sep 2007, Gabriel Marais wrote:
>
> On the Postfix server, as soon as a mail comes in with multiple
> recipients (10 or more) it just hangs in the queue.
Assuming that you haven't broken Postfix in the way that ABN AMRO did, I
expect that your Exim is taking too long over recipient verification or
some other ACL processing. If your ACL includes delays or callouts, and
your Exim is older than 4.67, and if Exim gets lots of pipelined RCPT
commands, the time taken to process the pipelined group can be larger
than the five minute SMTP timeout. Before 4.67 Exim would not send its
pipelined replies until processing all of the commands; from 4.67 onwards
it flushes its reply buffer before doing anything slow.
Tony.
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