Switch from Proton Mail to Posteo: step by step

How to move your mail, contacts and address from Proton Mail to Posteo without losing anything. Most moves take an evening to set up, then a few weeks of forwarding.

Moving fromGmailOutlook.comiCloud MailProton MailFastmailTutamailbox.orgPosteoZoho MailGoogle WorkspaceMicrosoft 365 BusinessMailfenceStartMailRunboxAnother providerMoving toGmailOutlook.comiCloud MailProton MailFastmailTutamailbox.orgPosteoZoho MailGoogle WorkspaceMicrosoft 365 BusinessMailfenceStartMailRunboxAnother provider

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1. Before you start

   • Check where your address lives. If it ends in @proton.me, it belongs to Proton Mail and stays there: you'll forward your mail and tell people your new address. If it's on your own domain, like you@yourname.co.uk, it comes with you: you'll change a few DNS settings.
   • Check the space you need. See how much mail you have in Proton Mail, and compare it with Posteo's plans (the cheapest is Posteo, €1 a month, with 4 GB).
   • Read the small print. Posteo's page covers exporting, cancelling and refunds under "Before you sign up".

2. Open your Posteo account

   Sign up on Posteo's website (No, €1 a month from the start), and turn on two-step sign-in straight away. You'll find the link on Posteo's page: Posteo.

3. Bring your mail across

   Export, then copy it in with a mail app. First save your mail as files: Free Proton Mail Export Tool for Windows, macOS and Linux saves every email as EML files, for any plan. Proton Mail's guide ↗

   Then open the files in a mail app connected to Posteo over IMAP (Thunderbird with its free ImportExportTools add-on), and drag them into Posteo's folders.

   Your old mail stays where it is while it's copied, so nothing is lost if you need to start again.

4. Move your contacts and calendar

   Export your contacts as a .vcf file and each calendar as an .ics file from Proton Mail, then import them into Posteo. Most providers have both options in their contacts and calendar settings. Posteo can copy your address book automatically from Gmail, iCloud, Microsoft, Yahoo, AOL, GMX and WEB.DE. Posteo's guide ↗

5. Keep your @proton.me address working

   1. Forward new mail. Look in Proton Mail's settings for automatic forwarding, and add your new address.
   2. Tell people. Send your new address to the people who matter, and add it to your email signature.
   3. Update your sign-ins. Change the email address on your bank, shopping, social and work accounts. A password manager's list of saved sign-ins is the quickest checklist.
   4. Keep the old account open for a while. Mail will keep arriving there for months. Sign in now and then so it isn't closed for not being used.

6. Check everything arrived

   • Compare the number of emails in each folder on both sides.
   • Send a test email to your new address from another account, and reply to it.
   • Check that mail forwarded from Proton Mail is arriving, and isn't going to spam.

7. Close Proton Mail, when you're ready

   Wait at least a month, until nothing new arrives there. On a free account you can leave it open with forwarding on instead. Before you close a paid account, download a last copy of your mail.

   • Cancelling: Cancel in your account dashboard before the renewal date.
   • Refunds: Full refund if you cancel and ask within 30 days of your first purchase, once per person; not for cash or bank transfer payments.
   • Renewal: Renews automatically at the price at the time of renewal, which can differ from what you first paid.

   From Proton Mail's page: Proton Mail.

I checked the providers' help pages on 24 October 2026. Menus move, so if a step doesn't match what you see, tell me and I'll update it.

Moving to Posteo from somewhere else? Gmail to Posteo · Outlook.com to Posteo · iCloud Mail to Posteo · Fastmail to Posteo · Tuta to Posteo · mailbox.org to Posteo · All switching guides