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Date:      Wed, 04 Oct 2006 19:27:35 +1100
From:      Mikhail Goriachev <mikhailg@webanoide.org>
To:        Karsten Fuhrmann <karsten_fuhrmann@cartoon-film.de>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: fetchmail -> sendmail problem
Message-ID:  <45237077.9000005@webanoide.org>
In-Reply-To: <EE877C94-1B37-4543-9A8D-06BDFF20F91A@cartoon-film.de>
References:  <EE877C94-1B37-4543-9A8D-06BDFF20F91A@cartoon-film.de>

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Karsten Fuhrmann wrote:
> Hello,
> i have a problem with some strange spam emails, which lock up my  
> email reception.
> The problem is the following : I am using fetchmail to download my  
> email (from a pop3 server), and fetchmail passes the email to my  
> local sendmail daemon who gives it to my local imap server (cyrus).  
> This works fine. But sometimes i got a spam email, which has an  
> unresolveable dns origin, and this makes my sendmail crazy in a way,  
> that sendmail wants to resolve but gets a timeout (around 20s). In  
> the meantime the fetchmail which is actualy waiting for sendmail to  
> accept the message gets a timeout from the pop server where it is  
> connected to.
> Because of that timeout fetchmail stops receiving email from pop  
> server and tries again next time, but next time it will start with  
> the same spam email again, and it all starts again, actually no more  
> new mails will arrive until i delete this particular email from the  
> pop server manually.
> 
> Is there a way to tweak the timeout behavior of sendmail, or maybe  
> even no dns resolve option for sendmail, or even better some way to  
> tell fetchmail to use the idle command to keep the connectio to the  
> pop server open ?


Add this to your .mc file:

FEATURE(accept_unresolvable_domains)

and let us know how it goes.


Cheers,
Mikhail.

-- 
Mikhail Goriachev
Webanoide

Telephone: +61 (0)3 62252501
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