On Fri, Jan 30, 2009 at 07:35:53PM -0500, Wietse Venema wrote:

> > 1) Jan 30 10:02:17 av5 postfix/smtp[10603]: C0AFB226F23:
> > to=<recei...@domain.tld>, relay=127.0.0.1[127.0.0.1]:10026, delay=8.9,
> > delays=1.3/0/0/7.7, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as
> > 95CEE226F30)
> 
> Postfix measures 7.7 seconds from start of delivery to end of delivery.
> 
> Either the content filter has a very slow SMTP implementation, or
> the content filter spends a lot of time to inspect the message.
> You can easily verify which it is, by looking with top or some
> other performance measurement tool.

Or the content filter is idle waiting for DNS reputation lookup lookups.
Beware high-latency filters.

-- 
        Viktor.

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