[Hobadee]

> unless the archive is considered an end and the connection to it is secure

LMAO NO! I have quite a few clients using Telemeasage, and most of them use Global Relay on the backend. It's a little terrifying actually, as Global Relay just ingests everything via SMTP. I haven't checked if they have DNSSEC or MTA-STS set up, but with how Global Relay operates I would be surprised if they did. I suspect a well-placed proxy or DNS poisoning could siphon off a good chunk of sensitive emails being sent to Global Relay.