I've been pretty happy with mailbox.org, German based and has support for various keys to use with custom domains (SPF/DKIM) including the ability to have the s

I've been pretty happy with mailbox.org, German based and has support for various keys to use with custom domains (SPF/DKIM) including the ability to have the same custom domain used across multiple accounts (nice for extended family domains and the like, safe as you still need to make the DNS changes on that provider). Pricing is reasonable and the limited support interaction I've had has been good. The webmail seems to be OX [1]. [1]: https://www.open-xchange.com/ https://www.open-xchange.com/