https://proxy.jmap.io/ https://proxy.jmap.io/ - it contains links to the source code if you'd like to run it yourself. It's just a few thousand lines of perl,

https://proxy.jmap.io/ https://proxy.jmap.io/ - it contains links to the source code if you'd like to run it yourself. It's just a few thousand lines of perl, and I wrote it in two groups of about 2 weeks each time (about 6 months apart) - and each time very much part time amongst other things. It's actually not that hard if you already have IMAP, CalDAV and CardDAV client libraries.