Migrating from Proton Mail to Fastmail

28 Feb 2025

Background

My slow-motion move away from Gmail is complete now with my recent change to Fastmail. I've been using a free Proton Mail account for this Bearblog, and it was quite alright, but now that I am on a paid Fastmail account, I want to consolidate.

I've updated my About page with my new eeeee.lol email address. I didn't want to lose any of the emails I've exchanged on Proton, so I've copied them over to Fastmail.

What I did

• Install and open Thunderbird

• Connect Fastmail to Thunderbird

  1. Log into fastmail.com
  2. Upgrade Fastmail to Duo plan
  3. Go to Settings > Migration > Apps & Setup guides > Set up Thunderbird
  4. Follow instructions on screen

• Connect Proton Mail to Thunderbird

  1. Log into proton.me
  2. Upgrade Proton Mail to Mail Plus for $1 and then cancel subscription
  3. Go to Settings > IMAP/SMTP > Proton Mail Bridge
  4. Download and install Bridge for Windows
  5. Open Proton Mail Bridge and follow instructions on screen to connect Proton account and email client

• Move Proton emails to Fastmail

  1. Go to Thunderbird
  2. Drag and drop emails from Proton's Inbox and Sent folders into Fastmail's Archive folder