Kevin,

> We have a virtual machine and adding more RAM is going to be expensive.
> 
> The server only does email and only looks after the email for a single
> domain - maybe at the very most a couple of thousand incoming and
> outgoing emails per day.
> 
> Is there any advice on setting the system up so is doesn't run out of
> resources - the default settings have resulted in an error of
> 
> (conversation with 127.0.0.1[127.0.0.1] timed out while receiving the
> initial server greeting) amavis postfix

How much RAM does your virtual machine have?
Does it have swap space?

Running out of memory usually results in fork() failing, which should
be logged (but it depends on where this happens). It is possible, but
not typical, that you would see the above error message from Postfix
because of this.  Try running amavisd as:

  # amavisd debug 2>&1 | tee 0.log

until the problem happens, see what is logged.

  Mark

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