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?
gihutgishuiruv
joined 10 months ago
Assuming you’re using postfix as an MTA, it’s not too hard to get OpenDKIM up and running.
My mail admin experience is pretty dated these days, but I followed this guide back in the day and had it working.
“This tree seems really sensitive, I ran a chainsaw through it and it just fell over???”
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