Emile Pesik
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An error occurred while saving the comment Emile Pesik
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Why not use IMAP instead? It has numerous advantages over POP mail, and it will let you do what you're asking for. See http://www.pop2imap.com
Perhaps ProtonMail could work together with the developer of EteSync (https://www.etesync.com/)? He already has achieved end-to-end encrypted synchronisation of _both_ contacts _and_ calendar data.
Synchronisation with Thunderbird is done via a similar idea to ProtonMail's IMAP bridge: a locally installed proxy (https://github.com/etesync/etesync-dav). It uses a locally installed CardDAV and CalDAV server (Radicale) with an EteSync storage plugin (https://github.com/etesync/radicale_storage_etesync).
Contacts are accessed in Thunderbird via the CardBook addon, a CardDAV based replacement for Thunderbird's own address book. Calendar data is accessed via CalDAV.
And for those using both ProtonMail and Gmail, CardBook can also synchronise with Google’s address book.
EteSync/EteSync-DAV, Radicale and CardBook are all open source.
Seems like all the hard work has already been done, so maybe the two sides should talk?
I've been using it for a few weeks and so far it works beautifully. It doesn't solve the problem of synced contacts in ProtonMail's web interface, but on Android and the desktop (Linux, macOS and Windows) it does. An iOS version is planned.