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This is replaced with merged #6026 and experimental #6226.

And regarding fingerprints, we just serialize them as usual. It should be impossible to create v5 and v6 keys with identical fingerprint, so they don't really need separate namespaces.

Implementation-wise what needs to change is that inbox loop or mvbox loop (depending on where sync messages should go) should produce messages using data from SQL table `multi_device_sync` and store...

I exported backup with this and got backup file of 2775587230 bytes. Unpacked it is 3326787584 bytes, so saved 15%. Not very helpful because most blobs are not compressible, but...

Let's wait until 1.50 releases are out.

I also have seen failures like this in CFFI tests: ``` lp.sec("ac2_offl: going online, checking the 'member added' message") ac2_offl.start_io() # Receive "Member Me () added by ." message. msg_in...

May be interesting to collect: - number of different domains for verified contacts - number of directly verified contacts - number of non-directly verified contacts.

> Second, send a big "attachment-only" email with just the attachment (and possibly with the text, if it didn't fit - not sure if doing this creates too much code...

IMAP can also download individual parts of the message, so better send multi-part message instead of two messages. Then there is no need to handle cases when one part arrives...

Some security concern is that MITM can replay old metadata, exchange metadata for messages etc. We should have some token from the full message (could be Message-ID from the protected...