this post was submitted on 25 Nov 2023
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A provider that isn’t on the ball about managing outbound spam will quickly find their IPs (if not the whole prefix) blocked. If someone runs a spambot from a VPS, and then you get the recycled IPv4 address when the instance is removed, what’s to tell Microsoft you’re not also a spammer?
I’ve been an admin for a couple of different companies that sent statements to customers. Keeping our legit email systems off spam lists was a daily challenge.
I work for a cloud provider, and even if I wanted to, I could not check for outgoing spam, other than reacting to the NOC mails.
Most mail server use transport encryption, which I can absolutly not inspect.
I never said anything about monitoring outbound SMTP traffic.
The more realistic mitigations are e.g. periodic scanning for open relays, actually handling abuse email reports, RBL checking