You can add custom domains, but you'll need to get domain hosting elsewhere and then connect it to ProtonMail. This service level allows 5GB of mail storage and up to five email addresses per user.

For more than 100 users, you'll need to contact ProtonMail directly for an accurate quote. You pay €6.25 ($7.37) per user per month on an annual basis the company's website has a simple slider bar you can ratchet up until you reach your user count and see your bottom line. ProtonMail Professional has a very simple payment plan for small to midsized businesses (SMBs). ProtonMail Professional Pricing and Plans Still, its lack of domain hosting and other niceties keep it behind our Editors' Choice winners in this category, Google Workspace Business Standard and Intermedia Hosted Exchange. ProtonMail Professional doesn't offer a free trial and doesn't include the ProtonVPN service, but its security features are extraordinary. You might know the consumer version of this service, which offers free accounts with 500MB of storage and 150 messages per day, but there's a business-oriented offering, too. ProtonMail is an ultra-secure email hosting provider based in Geneva, Switzerland.

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Protonmail custom domain setup