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thunderbird / thunderbird-android

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)
https://thunderbird.net/mobile
Apache License 2.0
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MIME encoded syntax (=?UTF-8?Q??=) shown in subject #3189

Closed tico-tico closed 6 years ago

tico-tico commented 6 years ago

I just recently got

screenshot2

Original subject line Subject: =?UTF-8?Q??= =?UTF-8?Q?=D0=9F=D0=BE=D0=B4=D1=82=D0=B2=D0=B5=D1=80=D0=B6=D0=B4=D0=B5=D0=BD=D0=B8=D0=B5=20?= =?UTF-8?Q?=D1=80=D0=B5=D0=B3=D0=B8=D1=81=D1=82=D1=80=D0=B0=D1=86=D0=B8=D0=B8=20?= =?UTF-8?Q?=20=D0=BD=D0=B0=20Bookland.com?=

you can see that the encoded text part of the first encoded-word-thingy is empty, maybe that's an issue.

cketti commented 6 years ago

=?UTF-8?Q??= is not a valid encoded word and hence not decoded. See RFC 2047, section 2. I'm hesitant to add support for this particular case. It doesn't feel like something that happens when 'encoded word' encoding is implemented naively. This seems like a more serious bug that should be fixed rather than worked around. That being said, both Thunderbird and Gmail's web interface don't show =?UTF-8?Q??= for the provided subject. Thunderbird does display =?UTF-8?Q??= when it's the sole value of the Subject header, it doesn't if that part is followed by anything else (encoded word or regular text). Gmail always ignores it.

tico-tico commented 6 years ago

Similar thing in the To: field:

screenshot4

To: =?utf-8?Q??= <fishburgzone@mail.ru>