"Hostile" vs. "Friendly" instances of Sendmail

Derek Ragona derek at computinginnovations.com
Fri Aug 25 20:04:06 UTC 2006

Use MailScanner and configure it to use blacklists and to delete not bounce 


At 02:57 PM 8/25/2006, Brett Glass wrote:
>A company for whom I do consulting has a FreeBSD mail server. Because 
>they're being deluged with connections from spammers (who have responded 
>to the increasing use of "graylisting" by ordering their armies of bots to 
>try again and again even when spam is rejected), they've subscribed to 
>some DNS blacklists and set Sendmail to limit the number of processes it 
>can spawn at any one time. This reduces the load on the system due to 
>spamming, but also prevents internal users from getting the mail server's 
>attention when they want to send legitimate outgoing mail.
>What's the best way to set things up so that more trusted, internal users 
>can access their own instance of Sendmail (with less restrictive process 
>limits, no blacklist checks, etc.) while the outside world sees an 
>instance of Sendmail with blacklisting, process limits, connection limits, 
>load limits, etc.? Will there be problems with file locking, queues, etc. 
>if a third instance of Sendmail is started on a standard FreeBSD install 
>(which normally runs two)? And where's the option that tells Sendmail to 
>listen only on a particular interface? (This should be on the man page, 
>but isn't.)
>--Brett Glass
>freebsd-questions at freebsd.org mailing list
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This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
MailScanner thanks transtec Computers for their support.

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