@Sempf @cR0w @ryanc @drscriptt
I mean, my experience is outdated, but at its height I was the sole sysadmin and abuse admin for a platform that served about 60,000 users, accepting or rejecting about a million SMTP delivery attempts a day. I was a very early implementer of things like graylisting and SpamAssassin, before you could even buy an appliance to do them, let alone a cloud service. But the landscape was very different then -- spammers were smaller scale and not big business then. The scars are old, but deep. Count yourself lucky. 😅