IMAP/SMTP + TLS support
Multi support are needed for heavy mail client (Outlook/Thunderbird/Evolution etc...)
Web access only is too limited

The ProtonMail Bridge supports IMAP/SMTP support for desktop clients: https://protonmail.com/blog/thunderbird-outlook-encrypted-email/
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Joel Dueck commented
This would undermine ProtonMail's entire security model. Ain't gonna happen. Go use GPG with a normal email account if you need IMAP.
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Dr. Thomas Kloss commented
It is necessary to use protonmail for me.
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JohnnyB commented
Hello,
Apple is not the only thing in the world ! We need IMAP for all plateforms
Thanks
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koder commented
Hi, Again I ask you for SMTP features. Is this possible? Mail forwarding option or vacation mail? Reg.
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Henning von Vogelsang commented
I understand server-side encryption is the key feature of ProtonMail. That wouldn’t change with adding IMAP support, it would just make the life of a lot of people easier, because they can then use their preferred native email client, including Apple Mail on the Mac or Mail on iPhone.
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AdminProton (Admin, Proton) commented
Integration With Mozilla Thunderbird
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AdminProton (Admin, Proton) commented
Offline I.E. Outlook/ Mail App/ Imap/Smtp Access