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A lot of them will let you if you ask, for instance even ionos or ovh. Digital ocean have a blanket ban on port 25 ipv6 but I haven't seen a reason to use them for a decade now. +1 for mythic beasts

Mythic beasts. Their IP ranges are pretty clean and well managed. My deliverability has been fine there for years.

They are quite expensive for some ranges of storage which you might need for IMAP if you need a lot less than where the HDD pricing starts.

On the other hand HDD is fine for a mail server and you can get 400Gb for not much more than some email providers will charge you for three 10Gb mailboxes.

"The expensive ones"