Doug Hardie:
> This is a small server with a few users that are all local.  There
> are several domain names that point to this server, but all of
> them are just aliases for the main name.  Received mail stops at
> the rcpt to: line.  There is no OK that occurs until shortly after
> 3 minutes from that line being received.  During that time ktrace
> shows multiple calls and sleeps for proxymap.  After the 3+ minute
> delay, it issues the OK and then they rest proceeds normally.  I
> suspect this is a configuration error since this server was just
> updated to 3.3.4 from an earlier version.  The earlier version
> worked fine.  This problem started when the upgrade completed.

By default, the Postfix SMTP server invokes the proxymap
service for local user lookup, because the default
local_recipient_maps setting looks like this:

    local_recipient_maps = proxy:unix:passwd.byname $alias_maps

Try, as a root user:

     postmap -q nosuchuser proxy:unix:passwd.byname
     postmap -q root proxy:unix:passwd.byname

I suspect that your proxymap service is busted.

        Wietse

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