Switching from ProtonMail to Fastmail

3 minute read Published 5 December 2020

Documenting my motivations for switching email providers, the steps involved, and first reactions.

In 2018, I decided to start using my own domain name for email. Running my own mail server would have cost more than using an email service, and there’s always a chance that other servers mark your emails as spam. So I signed up for a two-year ProtonMail Plus plan and set up my custom domain.

ProtonMail has served me well. But those two years are up now, and after re-evaluating my options, I’m switching to Fastmail. It’s a clear winner if you compare plans at the same price point:

PM PlusFM Standard
Price$96 / 2 years$90 / 2 years
Custom Domains1Unlimited
Custom Domain Aliases1600+
Catch-All EmailNoYes

Below is how I migrated:

Custom Domain🔗

This part was pretty painless. Fastmail gives provider-specific instructions for how to add their records. Interestingly, DKIM did not require a key pair like it does for ProtonMail.

Instructions for custom domain registration

Transferring Mail🔗

Exporting from ProtonMail🔗

Recently, ProtonMail released the Import-Export app. I used it to export my mail folders in .mbox format.

Importing to Fastmail🔗

Fastmail supports importing mail from popular hosted providers and IMAP servers directly from the browser.

Instructions for importing mail

ProtonMail doesn’t fall under any of those categories. It has the “bridge” app for local IMAP, but Fastmail can’t connect to that from their servers.

It turns out that there’s an indirect way to get mail in .mbox format onto Fastmail using Thunderbird. I last used Thunderbird over 5 years ago. The UI has definitely come a long way; it’s like Firefox but just for mail!

Thunderbird UI Mozilla Foundation, CC BY-SA 3.0

After installing Thunderbird, I configured IMAP following Fastmail’s instructions. Thunderbird doesn’t have built-in functionality to import from .mbox files so I installed the ImportExportTools NG extension.

I created a local folder called “ProtonMail”, and right clicking on that folder, selected ImportExportTools NG > Import mbox file > Import directly one or more mbox files > <pick mbox files> > Open. Now I had all my old mail from ProtonMail in Thunderbird. All that was left was to select all the messages, drag, and drop them into the equivalent Fastmail folders. Simple as that!

Android App🔗

In terms of functionality, the Fastmail app is far superior than other mail apps I’ve used. It appears to have feature parity with the website. What would be 5 separate Google apps is packed into a single app. Yet it doesn’t feel overcrowded.

My only gripe is that the third line of message text is cut off in the inbox view:

Android App screenshot

Overall, it was a pretty easy switch. It only took an hour and I’m set for the next two years.

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