smtp server test?

Kai Schaetzl maillists at CONACTIVE.COM
Tue Mar 15 20:31:50 GMT 2005

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Julian Field wrote on         Tue, 15 Mar 2005 19:13:26 +0000:

> If you do that, you won't ever get any mail from me for starters. My 
> outgoing mail handlers don't listen for SMTP from the net as well, that 
> is handled by other MX servers.

What you *can* do is check if the incoming mail address would be accepted 
for delivery on the MX for that domain. There are milters that do this.
I personally am opposed to that, though, since it adds an extra SMTP 
connection for each incoming mail and on the remote side for many outgoing 
mails (depending on how many people use it). I think it is much easier and 
better to just reject all attempts from dialups etc., check for correct 
HELO and so on right at MTA level. This doesn't put the burden on innocent 
third parties. And it's quite successful. We rarely get viruses because 
most are sent over zombie machines which are either in dialup ranges or 
already listed as being a proxy/zombie etc.


Kai Schätzl, Berlin, Germany
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