I usually suggest people to take a look at these: mailbox.org, runbox.com, mailfence.com, posteo.de (this last one doesn’t support custom domains). They’re all

I usually suggest people to take a look at these: mailbox.org, runbox.com, mailfence.com, posteo.de (this last one doesn’t support custom domains). They’re all cheap enough, provide IMAP and POP, and are located in different countries in Europe.