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People keep saying email has encryption, but in the rare cases when email is encrypted with pgp, only the contents of the messages get encrypted. Not the metadata. And apparently the metadata is the most valuable data for government snoops. They don't care as much what you've been saying, but knowing that you've been emailing back and forth weekly with some person of interest over the last 5 years is what they're really after.

Also pgp doesn't support any of signal's key ratcheting or deniability. And the web of trust leaks information publicly about who your contacts are! (And its vulnerable to Sybil attacks.)

Don't get be wrong, I love email and think its great. But it doesn't hold a candle to Signal when it comes to secure communication.

The same features are just not available. And messages may arrive sometime between 2 second and 2 days with no indication what happened. (Yes, highly skewed towards 2s, until you get graylisted)

I hadn't heard of mailtime! Last one I used was DeltaChat (https://delta.chat/) and it was super slow.