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Due to the recent Enigmail security issue, where e-mail drafts could end up unencrypted on IMAP servers. (You might wonder, no, Whonix was luckily not affected by this, because the version in Debian wheezy did not have that bug.)
In the PGP/INLINE example I can be more assured, that the text was that it really converted to encrypted ciphertext before sending – because I can see it.
PGP INLINE
As opposed to PGP/MIME, where I need to trust more, that Enigmail won’t mess that up.
PGP MIME
Using option ‘Confirm, before sending’ set to ‘Always’, that I highly recommend to prevent messing up.
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