At 12:25 11/17/2003, Filip wrote:

>I'm a bit confused about this.
>In your opinion, are they right to refuse messages from my server ?

I can't speak to the actual server you were rejected by, but my server 
typically rejects null sender messages (other than those destined to 
required role accounts, such as postmaster or abuse).

The reason for this is simple. There are currently several 
virii/trojans/worms out there that send mail to forged users (addresses 
made up by randomly selecting parts of addresses from the user's address 
book). There are also a lot of mail servers who do not do sufficient 
validation prior to accepting emails, preferring to produce bounce messages 
later. These two add together to produce a significant amount of traffic 
from "null sender" (some of the traffic is from brain dead mail servers 
sending bounces to forged addresses (from virii/worms/etc, and some of it 
is the virii/worms/etc sending their own made-up messages that look like 
bounces).

In the end, it's still the old rule - "your network, your rules". They run 
their mail server for their own benefit, and can do pretty much whatever 
they want to with it - just as you can with yours (and I do with mine).

Tracy 


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