If you want to self-host email, you need a trustworthy static IP address with reverse DNS. It's considerably more expensive to get this from an ISP. Our annual fee also includes storage for offsite backups. You don't get the same privacy assurances using Protonmail as you do with self-hosting either. For example, Protonmail is privy to the content of all outbound email messages in the clear unless you are communicating with the recipient using E2EE.

From a cost perspective, Helm V2 starts at $199 for 256GB of storage. First year costs, including subscription work out to $298. With Protonmail, their entry level plan with added storage at the same price buys you an inbox with about 28GB, a small fraction of what you would get with Helm storage-wise, not to mention we don't limit users, email addresses, domains, etc.