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List:       exim-users
Subject:    Re: sender_*_verify and coping with bad but non spam MTAs...
From:       Philip Hazel <ph10 () cus ! cam ! ac ! uk>
Date:       1997-10-21 12:38:56
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On Tue, 21 Oct 1997, Alan Thew wrote:

> What are people's experiences, especially at large sites where it's not
> always possibly just to block anyone or drop mail on the floor, like
> Universities....?

I've been blocking MAIL FROM addresses that fail to resolve for over 5 
years - long before I started to write Exim. However, it has never been 
acceptable here to drop mail on the floor.

> mail from:<user@badly_configured_mta.com>

*should* be rejected, IMHO, because doing so avoids more problems in the 
long run. If you accept such addresses and your user replies, *your* 
postmaster gets bothered when it doesn't work. If you reject it in the 
first place, then postmaster@badly_configured_mta.com gets bothered by 
the sending user, which is as it should be!

[Of course, things don't always work out like that. What often happens 
is that sender phones up receiver and says "I can't get mail to you; 
what's wrong with your site?", so your postmaster gets bothered anyway. 
Sigh.]

-- 
Philip Hazel                   University Computing Service,
ph10@cus.cam.ac.uk             New Museums Site, Cambridge CB2 3QG,
P.Hazel@ucs.cam.ac.uk          England.  Phone: +44 1223 334714


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