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I stand corrected[1], premium users can 'Combine multiple accounts into 1 account'. [1]:https://protonmail.com/support/knowledge-base/combine-accounts/ https:/

• wanderfowl 8y ago
  Yep, that's fine, but it's not much of a firewall. And unless I'm mis-reading this, this doesn't allow you to combine multiple domains.
  • lfms_dotfile 8y ago
    I've setup multiple domains on the same Protonmail account. You can create new addresses (@protonmail.ch/protonmail.com/pm.me/domain) with a paid account (iirc up to 5 total addresses with Protonmail Plus).