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We use Exchange as our mail router (defined in our SMTP properties) and an MMAIL *SRVPGM to do the transmission. Exchange does the actual delivery, which I guess is why the Exchange people didn't think IBMi should be looking at the MX record.
Thanks
-----Original Message-----
From: B Stone [mailto:bvstone@xxxxxxxxx]
Sent: Wednesday, August 14, 2019 3:20 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: 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).
midrange.com
