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. 2021 Jul 14;4:568284. doi: 10.3389/fdata.2021.568284

TABLE 4.

Confounding matrix of mail user agent (MUA) and encryption technology including the number of tests made.

Mail user agent PGP S/MIME pEp
Apple mail (iOS 12) - 1 -
Apple mail (MacOS desktop) - 1 -
Flowcrypt (gmail webmail) 2 - -
Maildroid (Android) 1 1 -
Outlook 2016 (desktop) 1 4 -
pEp app (Android) - - 4
Thunderbird (desktop) 1 2 6
Total 5 tests with 4 MUAs 9 tests with 5 MUAs 10 tests with 2 MUAs