Re: Fwd: Postfix SMTP server: errors from

> > Reading between the lines of the error message, it looks to me like
> > meiway.com's mail server is programmed to take the MAIL FROM address,
> > connect back to the sending server

Wrong, but it's an understandable error when firing from the hip with head
up the ass.

The attempt to deliver is made against the @sender.domain's MX RDATA fields.

This is a perfectly valid prerequisite: "we´ll accept mail from the sender
if the sender domain's MX hosts accepts mail from us". Not very BOFH at all.

>, and see if it can RCPT TO that
> > address before it will accept the incoming mail.

It's called "sender address verification" in postfix terms.

> > I have zero sympathy for that approach, but won't waste our list
> > bandwidth on exactly why it's a brain-dead sociopathic antispam
> > technique.

Excellent decision! Opionated, self-righteous, half-informed assholes
waste enough bandwidth.

>220 postgresql.org ESMTP Postfix (2.0.2)
>vrfy pgsql-admin-owner+M7187(at)postgresql(dot)org
>252 pgsql-admin-owner+M7187(at)postgresql(dot)org
>
>should have worked ... I know I was having problems with the use of the +
>in the email address, that I just fixed .. maybe this was just before that
>fix/

I will un-whitelist that ip and we'll see very quickly:

Feb 3 03:07:41 Mgw1 postfix/smtp[74990]: 929D1EF908:
to=<pgsql-admin-owner+M7227(at)postgresql(dot)org>,
relay=mail.postgresql.org[64.49.215.8], delay=1, status=deliverable (250 Ok)

Excellent, thanks for fixing postgres list server. It now validates like
every other discussion list servers we subscribe to, and as it did until it
was very recently broken.

Len