I was quite surprised and found this one really clever:
[attach]
[attach]
Thunderbird has similar heuristics.

I've definitely had it say something along the lines of "hey, did you forget an attachment?" before sending mailsThunderbird has similar heuristics.
I've been using Thunderbird for many years. Can't remember ever having seen that. But then I never read the help file

Thunderbird has similar heuristics.
I've been using Thunderbird for many years. Can't remember ever having seen that. But then I never read the help file
Thunderbird has similar heuristics.
Can be done with a client-side javascript check btw, so doesn't necessarily mean "google reads your emails" (though of course they do datamine heavily).
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