Justin,

Noel Jones wrote:
> Top output is not very useful here.  Show logs.  amavisd-nanny and/or
> amavisd-agent might also provide useful information, but the logs are
> the place to start.

Indeed.

- A TIMING log entry at log level 2 is one thing
  to look for.

- the other is setting a:
    $nanny_details_level = 2;
  and looking at amavisd-nanny running display
  ('amavisd-nanny -h' shows a legend).

- the third are TimeElapsed* lines as reported
  by amavisd-agent.

There are many possible reasons for a slowdown,
could be a bayes database autoexpiration, could be
one of DNS servers being down, not responding to
RBL/DNSURI/Razor/Pyzor/Dcc requests, ...
Some of us find the rbl_timeout default of 15 seconds
to be too high. Also, make sure your DNS resolver and
your network connectivity is in good shape.
If using SQL logging (PenPals), perhaps a database
needs maintenance (purging/optimizing).

  Mark

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