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<DIV id=idOWAReplyText48887 dir=ltr>
<DIV dir=ltr><FONT face=Arial color=#000000 size=2>We use postfix and yes if it was a 550 reject code then we wouldn't use this facility. Have also found recently that if you reject on non fully qualified domain names then alert emails from mcafee's alert manager that send through internet are rejected as the emails aren't correctly formed. The from field gets picked up as empty by postfix.</FONT></DIV></DIV>
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<FONT face=Tahoma size=2><B>From:</B> John Wilcock<BR><B>Sent:</B> Tue 29/05/2007 10:27<BR><B>To:</B> MailScanner discussion<BR><B>Subject:</B> Re: Reject mail from invalid domains<BR></FONT><BR></DIV>
<DIV><PRE style="WORD-WRAP: break-word">Jason Ede wrote:
> Surely it makes sense to at least check if the sender is a fully
> qualified domain and also that there is an MX record for that domain?
In theory, yes. In practice, poorly configured mail servers are not
uncommon and sooner or later you will end up rejecting genuine mail if
you insist on this.
Also, consider what will happens if a sender domain's name servers are
temporarily unavailable. [With postfix, the default reject code for an
unknown helo hostname is 450 rather than 554 for precisely this reason].
John.
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