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Hosting an email server is pretty sure a magnet for half the Chinese IP range… So I would refrain from hosting that myself.

I figured email would be a common theme. I’m just starting to dip my toes into all of this, so an email server is not on my to-do list (and may never be).

Google and other large scale providers have intentionally made it very difficult to self host your own email. It’s generally not considered a wise move these days and is very difficult to maintain.

Why do you say so? I’m not an expert in the fields, but isn’t a mail server pretty much the same as 20 years ago plus DKIM and SPF?

ip-reputation is also important. Mailgun, an email service for mass mailing, is doing an „ip-warmup“ if you choose a dedicated ip. So, if you are self-hosting with dynamic-ip, i think you would have a very very low ip-reputation.

True, but this has nothing to do with Google and other, is a well done method to avoid spam.

so what else is a factor for reputation? Or is it like if you dont pay to get your mail-domain whitelisted we lower your reputation score?