Re: [courier-users] lingering courieresmtpd

Thomas van Gulick wrote:
>>
>> I disagree. Accepting mail without verifying the recipient is idiocy,
>> given the realities of the internet.
>
> I'm not accepting the mail. My provider is just forwarding the mails and
> courier nicely returns '550 User unknown.'.

Yes, your provider is accepting mail on your behalf, but is not checking
the user part of inbound mail. That is, frankly, stupid.

In situations where it's unavoidable, you should make every effort not
to refuse mail at any point past the one where mail is accepted from the
internet. Bouncing/refusing mail will clog your own mail servers, and
bounce mail to users who didn't send the original message.

>> It probably doesn't. It does, however, tarpit servers that send bad
>> commands, including directing mail to non-existent users.
>
> But I get lots of courieresmtpd processes hanging around doing nothing,

Which is what they're supposed to do. When a mail server (any server,
even your virus scanner) starts spewing crap at a Courier system,
Courier responds by doing nothing for increasingly long periods of time.

In order to remedy the situation, you have to make the garbage that the
virus scanner is sending you "not garbage". The simple way to do this
is to put a .courier-default file in your system which will simply drop
all mail that it receives (one blank line will do). By adding that file
to Courier's configuration, all email addresses suddenly resolve. It's
the right thing to do in your situation. It will almost certainly fix
your problem.


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