RackNerd offers one for $10.99 a year [1]. I've used them before and they are a solid provider. Besides you can use the same server and same IPv4 address for hosting multiple email domains.

[1] https://vncoupon.com/black-friday-racknerd-huge-savings-spec...

15 USD or EUR a year is almost trivial.

It will have more than enough resources for SMTP, IMAP, HTTP, and even a personal VPN.

It's really not difficult.

The problem is that most IPs will be tainted and unless you are a major player, email deliverability sucks.

That's why I asked, because these guys were unknown to me.