[julienmarie]

What email warming services do is they create activity between your server and hundreds of email accounts they manage on major ISPs and they make sure to click on "not spam" if it falls under spam, and try to bring your emails to the main inbox.

It's a bit of a grey area thing in fairness.

[Avamander]

If service providers don't already detect such users it's quite guaranteed that they will in the future.

Trying to game the system is frowned upon in all cases.

[tetrisgm]

Oh cool. So that's what mailreach does? Sounds great tbh

[xcdzvyn]

Sounds malicious.

[actionfromafar]

Not inherently. Whole IP blocks seem more or less black-listed by Google and Microsoft. So if you happen to get a server in that block, you can't send email.