I was using Verizon's smart host as a mail relay for notifications in the UTM, but Verizon has started blocking my emails for an unspecified reason.
Rather than messing with Verizon, I've now configured the UTM to relay notifications through gmail.
This will work to the same gmail account, to a different gmail account, and should work to any email address.
I'm only using it in the notifications settings, but it might work for a full smarthost in the SMTP settings... I wouldn't try it for anything other than personal use though as your email address will probably get added to all the mail headers.
Setup:
in Management->Notifications->Advanced,
set SMTP server to 'smtp.gmail.com' using a DNS Host Defintion
SMTP Port: 587
Use TLS: checked
Authentication: checked
Username: your gmail address
Password: your gmail password
If you are using 2-factor auth with gmail, you'll need to setup an App Password for the UTM; see https://support.google.com/accounts/answer/185833?hl=en
Troubleshooting:
The easiest way to force a notification email is to try logging in to webadmin or SSH with a bad password.
Check the Notification Log (notifier.log) for errors.
Barry
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