[TheGrumpyBrit]

If you're sending 500 unsolicited emails a day, you're spamming. "Cold outreach" sounds very much like a nice way of saying "Spamming" to me, and I wouldn't want to share a mail server with you.

For me, the bigger red flag is the response you got - I would expect a reputable mail provider to make it abundantly clear that the behaviour you describe is not welcome on their service.

[marcamillion]

I hear you. The term 'spamming' is quite subjective.

Either way, the fact of the matter is sending cold emails is actually a powerful way to build sales -- there is a simple reason so many people do it, it works.

Like it or not, many startups do it.

So I was simply pointing this out for the OP's benefit.

[TheGrumpyBrit]

There's an equally simple reason why they do it from botnets or hacked mail servers. It's illegal in many places, and its a great way to get your mail host blacklisted. There is no benefit whatsoever for OP to allow spamming through his service.