Proton Mail > https://proton.me/business/plans https://proton.me/business/plans Mailbox.org > https://mailbox.org/en/business-customers https://mailbox.org/en/

Proton Mail > https://proton.me/business/plans https://proton.me/business/plans Mailbox.org > https://mailbox.org/en/business-customers https://mailbox.org/en/business-customers Migadu > https://www.migadu.com/pricing/ https://www.migadu.com/pricing/ Startmail > https://www.startmail.com/secure-business-email https://www.startmail.com/secure-business-email All the above are hosted in EU.