[Mailman-Users] Problems sending to prodigy.net mail server addresses

Joseph Brennan brennan at columbia.edu
Mon Feb 11 16:21:05 EST 2019

On Tue, Feb 5, 2019 at 1:07 AM Richard Johnson <raj at mischievous.us> wrote:

> I run a small mailman server for our historical recreation group.  Lately,
> I've been seeing messages like:
> <email at hostname>: host al-ip4-mx-vip1.prodigy.net[] said:
>   550 5.7.1 Connections not accepted from servers without a valid sender
>   domain.alph733 Fix reverse DNS for (in reply to MAIL FROM
>   command)

> host domain name pointer peacock.place.
> host peacock.place
peacock.place has address

The DNS records look perfect to me. If you're going through a time warp to
Prodigy maybe the new top-levels like .place don't work yet? You get the
error after MAIL FROM because that's the earliest point when a server is
allowed to 550.

The thing that puzzles me is that "domain.alph733" in there. I don't know
what that is. If you're sending that in the HELO / EHLO then that is an

Joe Brennan
Columbia University

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