Re: DNS lookup for SMTP

MX lookups really are only done when you are delivering directly from your
IBM i to the recipient. Ie, you send an email to bvstone@xxxxxxxxx with
no mail router... your email client needs to look up MX records for
gmail.com to know where to deliver the email.

But that in itself is rarely done, or at least should be rare and a mail
router is normally used.

When using a mail router, you hand off the mail to the mail router and the
router does the actual delivery.

With MAILTOOL, for example, there is an option to NOT do an MX lookup. But
even when it's on rarely are there any MX records set up for the Mail
Router, so it returns nothing and uses the host name provided for the mail
router.

One caveat.. I did have one customer set up local MX records for the mail
router to be used like "A" records for backup reasons if I recall.. it was
a while ago though.

Bradley V. Stone
www.bvstools.com
MAILTOOL Benefit #13 <https://www.bvstools.com/mailtool.html>: The ability
to use an IFS stream file as the body of the email (either text or html).

On Wed, Aug 14, 2019 at 3:07 PM Justin Taylor <JUSTIN@xxxxxxxxxxxxx> wrote:

Our Exchange admin changed the server IP today, and IBMi was no longer
able to relay mail. My SMTP server has the hostname of the Exchange
server. The Exchange admin says that IBMi is resolving the host name using
the MX record in DNS instead of the A record in DNS. I have a
Dick-and-Jane understanding of DNS, and I'd never heard of an MX record
before today.

Can anyone shed some light on this? What record type should IBMi use? Is
there a way to configure it?

TIA
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