0

In our network, we have na IBM Lotus Notes server, which handles emails for basedomain.com.

Recently we introduced a new IIS Smtp server just for sending automated emails. The Smtp is configured for a domain subdomain.basedomain.com. The server also has a DNS record for subdomain.basedomain.com

Sending emails outside of our network works fine, however it fails when we try to send an email to [email protected] - the email returns with an 5.3.5 error.

We even tried the SMTPDiag tool to test the connection and it ended OK, it listed the correct end-server for email address [email protected].

Why doesnt it work when sending real email?

2
  • 1
    could you post the actual error message?
    – Str82DHeaD
    Sep 25, 2013 at 11:21
  • The message just says 5.3.5 Sep 25, 2013 at 14:39

1 Answer 1

0

5.3.5 is a loopback error, meanining it cannot relay to itself.

It seems your new SMTP is trying to do just that when handling @basedomain mail.

Could be helpfull to see the IIS config

1
  • 1
    Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.
    – Community Bot
    Dec 2, 2021 at 18:25

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .