[Mailman-Users] Reject by default - will the spam increase?

Chris Johnson johnson at nmr.mgh.harvard.edu
Thu Dec 4 15:55:27 CET 2003

On Thu, 4 Dec 2003, Michael Stucki wrote:

> Hi all,
> due to a big spam amount, I have switched my lists to only accept mails from
> list members.
> After to weeks of production use, I note that many people use a wrong email
> address (not the one they used for the subscription).
> Therefore, I'd like to send a rejection response on all messages from such
> non-members.
> My question is: Since spammers are non-mebmers as well, will their bots
> understand my response as a validation (this address is being read) or will
> he handle it as an error response and probably delete it from the list?
> What would you do?
> Thanks - michael

     They will see any response as a notice that there is something
there to receive mail and to which more annoying spam can be sent.  
If this is a unix/linux system try MailScanner and SpamAssassin.
That's what we did.  

Chris Johnson               |Internet: johnson at nmr.mgh.harvard.edu
Systems Administrator       |Web:      http://www.nmr.mgh.harvard.edu/~johnson
NMR Center                  |Voice:    617.726.0949
Mass. General Hospital      |FAX:      617.726.7422
149 (2301) 13th Street      |Survival, all by it self, isn't worth it.
Charlestown, MA., 02129 USA |                 Me

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