8 messages in net.sourceforge.lists.courier-users[courier-users] Re: How to control DSNs
FromSent OnAttachments
Alessandro VeselyFeb 2, 2003 11:27 pm 
Sam VarshavchikFeb 3, 2003 5:02 am 
Alessandro VeselyFeb 3, 2003 11:42 am 
Sam VarshavchikFeb 3, 2003 4:15 pm 
Alessandro VeselyFeb 4, 2003 12:52 am 
Sam VarshavchikFeb 4, 2003 4:45 am 
Alessandro VeselyFeb 4, 2003 10:45 pm 
Peter J. HolzerFeb 5, 2003 7:15 am 
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Subject:[courier-users] Re: How to control DSNsActions...
From:Alessandro Vesely (ves@tana.it)
Date:Feb 4, 2003 12:52:39 am
List:net.sourceforge.lists.courier-users

Sam Varshavchik writes:

Alessandro Vesely writes:

if such [DSNs] specifications can/should be overridden, so as to avoid helping spammers confirm addresses.

Spammers do not need DSNs to confirm addresses.

Did you actually ever log a succesful dictionary attack against a Courier server? What happened?

Spammers just use typical addresses (e.g. sales@yourdomain). Also, many people give away what they believe to be a fancy address, but may actually match some aliasing criteria at the domain.

In addition, some spammers, after giving a wrong sender address, also require a DSN that will thus bounce to postmaster's box.

What would you suggest? I'd be tempted to build a white list for DSNs.

Ale