nanog mailing list archives

Re: ingress SMTP


From: Jeff Kinz <jkinz () kinz org>
Date: Fri, 5 Sep 2008 13:38:32 -0400

On Fri, Sep 05, 2008 at 10:35:15AM +0200, Mikael Abrahamsson wrote:
On Fri, 5 Sep 2008, Simon Waters wrote:

If the ISP blocks port 25, then the ISP is taking responsibility for
delivering all email sent by a user, and they have to start applying rate
limits.

MUAs should stop sending email via 25 and use 587 or equivalent instead. 
There is little actual reason why someone should be able to send TCP/25 
SMTP email from a residential connection when most software support 
authenticated TCP/587 submits.

Just FYI- the ISP has the same 220 email address limit even when I send
thru port 587, authenticated.  (its comcast)

We don't allow most of our residential customer base to speak SMTP TCP/25 
to anywhere at all (and we have millions of them). Wish more ISPs would do 
the same.

-- 
Mikael Abrahamsson    email: swmike () swm pp se

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