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Mail relay to Office 365 from IIS SMTP Relay
Since about a month we cannot relay email from our IIS SMTP Relay to Office 365. This has worked for a long time, therefore I do not get why it is not working anymore. The account used is still activ...
Hi, this is an old post but I got this same issue. I had to enable the SMTP Auth option at the mailbox level, on Office 365:
Enable SMTP AUTH for specific mailboxes
- Open the Microsoft 365 admin center and go to Users > Active users.
- Select the user, and in the flyout that appears, click Mail.
- In the Email apps section, click Manage email apps.
- Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.
Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.
Step 4 must be enabled. in order to work ?
Step 4 must be enabled. in order to work ?