Re: [exim] error 451-Could not complete sender verify callo…

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Author: Dave Evans
Date:  
To: exim-users
Subject: Re: [exim] error 451-Could not complete sender verify callout ??
On Mon, Mar 10, 2008 at 03:39:30PM +0200, Johann Spies wrote:
> On Mon, Mar 10, 2008 at 03:02:57PM +0200, Gregory Machin wrote:
> > Hi 
> > I'm trying to subscribe to a list from a valid that I use every day what have I done wrong ? or mis configured in my attempt to block spam ..
> $exim4 -bt greg@???
> nslookup for greg@???
> greg@???
>   router = dnslookup, transport = remote_smtp
>   host mail01.ct-net.org [196.211.39.147] MX=30
>   host mail02.ct-net.org [196.211.39.148] MX=40
>   host fake01.ct-net.org [unknown]        MX=50 ** unusable **

>
> Maybe the last line is your problem.


Or maybe the fact that you're deferring:

MAIL FROM:<>
250 OK
RCPT TO:<greg@???>
451 Greylisted - please try again a little later.
quit

(after a fairly long wait).

That won't play terribly well with sender callouts. (i.e. as is often the
case, one anti-spam feature is broken by another anti-spam feature).

--
Dave Evans
http://djce.org.uk/
http://djce.org.uk/pgpkey