If it's cost you’re worried about there are some creative options: - Use Cloudflare mail beta with your SMTP - POBox.com (fastmail lite in essence) - Migadu

If it's cost you’re worried about there are some creative options: - Use Cloudflare mail beta with your SMTP - POBox.com (fastmail lite in essence) - Migadu - Servermx - Host your own solution on a VPS and use for example postmark for sending e-mail.