Postfix Address Verification

Drew Marshall drew at
Thu Jun 28 09:46:55 IST 2007

On Wed, June 27, 2007 23:46, Seamus Allan wrote:
> It seems after implementing this that I am having a lot of spam stopped
> at MTA level - this is very good.<br>
> However, the next morning I came in to discover that some of the
> domains we host were not getting any email.<br>
> I used telnet to pretend to have a fake session with the smtp server,
> and interestingly, when trying to do a rcpt <a
> class="moz-txt-link-abbreviated"
> href="mailto:to:user at">to:user at</a>, I
> get the following error message.<br>
> 450 <a class="moz-txt-link-rfc2396E"
> href="mailto:user at">&lt;user at;</a>:
> Recipient address rejected: Domain
> not found<br>
> Why is this happening? How come that Postfix is able to look into the
> transport map and check the next server in line to see whether the user
> is valid for most of the domains, but not for some. Is there a
> misconfiguration somewhere? Is the verify map full or something?<br>

Firstly, please could you not use HTML mail. It does become something of a
mess (As you can see above) when working in plain text.

Anyway, check your maillog as I would expect the domain not found error to
come from a Postfix client access restriction (Reject unknown sender
domain for example) and nothing to do with your recipient maps. The logs
will tell you more.


In line with our policy, this message has been scanned 
for viruses and dangerous content by the Technology Tiger MailScanner.
Further information can be found at

Technology Tiger Limited is registered in Scotland with registration number: 310997
Registered Office 55-57 West High Street Inverurie AB51 3QQ

More information about the MailScanner mailing list