Draytek Vigor 2962 (v4.4.3.1)

I'm trying to setup the mail server feature with Microsoft 365 so I can use it for VPN email 2FA. I have entered all the details in the Mail Server object setting and when I do a test I receive the test email - success.

When dialing the VPN however I don't receive any emails for the 2FA. Looking at syslog I can see the following entries repeated multiple times, even when I'm not dialling the VPN. Any ideas?

EDIT: Just to add I have also tried replacing the SMTP server with an IP, the test sends ok but still don't get the VPN 2FA and still seeing errors in syslog.

Warning! Email SMTP server could not get ip!.
Email send Failed. (WAN)

I have managed to get it working, looks like the test emails were delivered ok but the 2FA ones were going into email quarantine as they have a URL in them.

The syslog is still showing the same error messages though about could not get IP?