IMO, it depends on how many mailboxes and aliases you need. Providers like Fastmail charge by the mailbox (with up to 600 aliases for each). Same with Runbox, M

IMO, it depends on how many mailboxes and aliases you need. Providers like Fastmail charge by the mailbox (with up to 600 aliases for each). Same with Runbox, Mailbox.org, etc. (the number of aliases varies). Migadu provides unlimited domains, mailboxes and aliases for a fixed price that decides how many outgoing mails you can send everyday from all mailboxes in that account.