Dan_Mitton-2 wrote:
>
> Have you tried doing something like a tcpdump on port 25, from either
> machine, to see if Exim is really sending the 451 error? Unless your
> doing TLS between your mass mailer and Exim, all of the communication
> should be fairly readable.
>
Thats an excellent suggestion, I will have a look at it today.
Thanks for the input.
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