[dmarc-discuss] MLM and Header-From rewritting - the SMTPopen-relay analogy

David Woodhouse dwmw2 at infradead.org
Sun Jun 8 10:36:47 PDT 2014

On Sun, 2014-06-08 at 10:50 -0500, Al Iverson via dmarc-discuss wrote:
> > Again, closing relays carried an entirely adequate alternative via port
> > 587 for authorized users.  No such equivalence is available when DMARC
> > breaks mailing list use.
> Not at first it didn't -- it looks like port 587 submission was
> specified in RFC 2476 which was December 1998. The relay wars were
> underway by then and it took some time to garner acceptance and
> adoption.

I was going to point out that MSA on port 587 is an almost orthogonal
issue — that mostly deals with local networks which block or hijack port
25 and thus prevent people from accessing their home SMTP servers.

SMTP authentication is possible on port 25 too... although actually it
looks like RFC2554 didn't define that until *later*, in March 1999.


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