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Re: ASIP Mail Relay
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Re: ASIP Mail Relay


  • Subject: Re: ASIP Mail Relay
  • From: John W Baxter <email@hidden>
  • Date: Wed, 6 Feb 2002 20:50:35 -0800

At 15:55 -0500 2/6/2002, Michael Sullivan wrote:
>If not, then a real solution is easy -- block the SMTP port on your
>firewall for all IPs except your mail provider and the IPs you are
>responsible for. (You can also configure an allow/deny list of IPs in
>ASIP Mail, I believe)

This will cause mail sent out to a not-huge but not-insignificant set of
SMTP servers to be declined out of hand. That doesn't matter (or show up)
until a message is sent to one of them. It may then
produce an error during the SMTP connection, which is reported to
someone (the sender's email program, or the administrator, or ?)
cause the message to sit on your outgoing mail queue being retried for a
few days, and then a failure message back to the sender (there may be a
lengthy wait for a timeout each try)
cause the message to disappear onto the floor at the other end with no
notice.

These sites want to know that they can reach your mail server, or the
address in the MAIL FROM: command (which need not have anything to do with
the From: header), or at least the domain in the MAIL FROM: (so they can
send mail to Postmaster@, which every mail server "MUST" accept) should
they need to bounce the message after accepting it. Otherwise, they won't
accept responsibility for the message.

--John

--
John Baxter email@hidden Port Ludlow, WA, USA
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References: 
 >Re: ASIP Mail Relay (From: email@hidden (Michael Sullivan))

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