VCSA SMTP Alerts not going out via port 587 despite being configured in Advanced Settings

Doesn't seem to be too much on the internet and I have a case open with support # SR 2013496530 so I'm looking for inspiration here

I have set advanced settings for SMTP specify the Office relay FQDN username, password and port 587.

I have also edited the submit.cf and added smartest entry which is still active ie. DS[smtp.office365.com] and restarted sendmail.

When I trigger an alarm I get an error in Events saying that

Alarm 'TEST SMTP ALERT' on

Servername

cannot send email to dturner@lxxxxxxxxxx.xxx

I look at the firewall logs and I see it is still trying to connect to Microsoft server on port 25.

I tried adding in the port number to Submit.cf in the SMTP daemon options, restarted sendmail but still went out on port 25 so I have since commented this out and restarted sendmail.

Anyone got any other configuration suggestions please?