Hello,

I've noticed that I'm seeing a lot of "Sender domain must resolve" messages
in my Postfix logs, most of which are from messages sent thru Mailman.  I know
this isn't specifically a mailman issue, as the errors are coming from the
other SMTP servers, but perhaps someone here can help shed light on this.

Here's some of the errors from my log:

         5   host smtp1.cei.net[204.117.117.29] said: 451 4.1.8 
<[EMAIL PROTECTED]>... Sender domain must resolve
         5   host edify-ministries.org[209.190.211.167] said: 451 
<[EMAIL PROTECTED]>... Sender domain must resolve
         5   host mail.hiwaay.net[208.147.154.56] said: 451 4.1.8 
<[EMAIL PROTECTED]>... Domain of sender address [EMAIL PROTECTED] 
does not resolve
         5   host mail.odyssey.on.ca[209.213.224.2] said: 451 4.1.8 
<[EMAIL PROTECTED]>... Domain of sender address 
[EMAIL PROTECTED] does not resolve
  
Note that apostles-today.net resolves nicely to an IP address.  This is a
virtual host on a shared IP, so a reverse IP lookup obviously isn't 
going to show the 50 or so addresses on that IP.  Is there something else I'm missing?

Bob

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