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Proton Mail supports forwarding on paid Proton Mail plans. You can add conditions so only selected messages reach Mermail.

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Prerequisites

  • A Proton Mail Plus, Proton Unlimited, or other paid Proton Mail plan.
  • A Mermail mailbox address.
  • Access to Proton Mail account settings.

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Create a forwarding rule

1

Open Proton settings

Sign in to Proton Mail and select Settings → All settings.
2

Start a forwarding rule

Select Forward and auto-reply, then click Add forwarding rule.
3

Choose the addresses

Select the Proton address to forward from and enter the Mermail mailbox address in Forward to.
4

Add privacy conditions

Click Add condition and define the sender, subject, attachment, or other criteria that identify messages safe for Mermail AI.
5

Send confirmation

Save the conditions, click Send confirmation email, then approve the request from the message delivered to Mermail.
6

Confirm activation

Return to Proton Mail and verify that the forwarding rule is active.
Forwarding to a non-Proton address disables end-to-end encryption for mail to and from the Proton address being forwarded. Proton states that this does not affect your other Proton addresses. Consider using a dedicated Proton address for the Mermail workflow.

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Forwarding limitations

  • Proton does not re-forward messages that were already forwarded into Proton Mail.
  • The destination must accept the confirmation request before forwarding starts.
  • Conditional forwarding and account-wide forwarding both require a paid Proton Mail plan.

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Test the setup

Send one new message that matches the conditions and one that does not. Confirm that only the matching message appears in Mermail.

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Stop forwarding

Open Settings → All settings → Forward and auto-reply. Use the rule’s action menu to pause, edit, or delete it.

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Human takeover

If you reply to a forwarded thread directly in Proton Mail, Mermail treats the entire thread as human-managed and permanently stops AI processing for it.

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Troubleshooting

For current provider instructions and encryption details, see How to use email forwarding.