> Mine is going on 15 years.
I've been doing it for more like 30.
> In practice, you have to actually try pretty hard to misbehave enough for Google and Microsoft to notice and block you.
As far as I can tell, the "misbehavior" that got me blocked by Microsoft was being hosted on Linode... where I'd been for around ten years at that time, all on the same IP address. Tiny server, had never emitted a single even slightly spammy message, all the demanded technical measures in place, including the stupid ones.
Because of the huge number of people stupid enough to receive their email through Microsoft, I had to spend a bunch of time "appealing". That's centralization.
On edit: Oh, and the random yahoos out there running freelance blocklists can do a lot of damage to you, too, by causing smaller operators to reject your mail.
I've been doing it for more like 30.
> In practice, you have to actually try pretty hard to misbehave enough for Google and Microsoft to notice and block you.
As far as I can tell, the "misbehavior" that got me blocked by Microsoft was being hosted on Linode... where I'd been for around ten years at that time, all on the same IP address. Tiny server, had never emitted a single even slightly spammy message, all the demanded technical measures in place, including the stupid ones.
Because of the huge number of people stupid enough to receive their email through Microsoft, I had to spend a bunch of time "appealing". That's centralization.
On edit: Oh, and the random yahoos out there running freelance blocklists can do a lot of damage to you, too, by causing smaller operators to reject your mail.