[camgunz]

Ah so you were a bulk sender. Yeah that's pretty fraught; AFAIK for Gmail you have to follow their bulk sender guidelines [0], which is a pretty long list of things to do. Not impossible though.

But, again most people aren't sending 5m emails a month. They'll be totally fine setting up their own email server.

[0]: https://support.google.com/a/answer/81126?visit_id=638526753...

[alan-hn]

I had a mail server on a linode for around a year, I tried everything I could to get google to accept my emails and it never did. I only used it as a personal email never did bulk sending. I had to switch to a hosted provider with a custom domain instead because it was such a big headache

[camgunz]

I don't have any experience with them, but you could maybe use Google's postmaster tools to debug.

[alan-hn]

I tried that, nothing helped. I even registered the domain with google and added their verification to my DNS records