stalwartlabs
Missing charset labels
We've hit a charset label that is not recognized by this crate, but is recognized by encoding_rs. Upon further testing, there are 108 charset labels that are not recognized by mail-parser but are included in the encoding_rs crate.
l9 koi utf8 koi8 sjis ucs-2 ms932 utf-8 ascii x-gbk cp1250 cp1251 cp1252 cp1253 cp1254 cp1255 cp1256 cp1257 cp1258 visual korean x-sjis ksc5601 gb_2312 dos-874 cn-big5 unicode chinese logical koi8-ru x-cp1250 ksc_5601 x-cp1251 iso88591 csgb2312 x-cp1252 iso88592 x-cp1253 iso88593 x-cp1254 iso88594 x-cp1255 iso88595 x-x-big5 x-cp1256 iso88596 x-cp1257 iso88597 x-cp1258 iso88598 iso88599 us-ascii x-euc-jp iso885910 iso8859-1 iso885911 iso8859-2 iso8859-3 iso885913 iso8859-4 iso885914 iso8859-5 iso885915 iso8859-6 iso8859-7 iso8859-8 iso-ir-58 iso8859-9 csunicode iso8859-10 gb_2312-80 iso8859-11 hz-gb-2312 iso8859-13 iso8859-14 iso8859-15 iso-ir-149 big5-hkscs windows-949 csisolatin9 csiso88596e csiso88598e unicodefffe unicodefeff csiso88596i csiso88598i windows-31j x-mac-roman iso-2022-cn iso-2022-kr csiso2022kr replacement iso-8859-6-e iso-8859-8-e iso-8859-6-i sun_eu_greek csksc56011987 unicode20utf8 unicode11utf8 ansi_x3.4-1968 x-mac-cyrillic x-user-defined csiso58gb231280 iso-10646-ucs-2 x-unicode20utf8 x-mac-ukrainian iso-2022-cn-ext unicode-1-1-utf-8
Some of these will not matter because of fallback to utf8: utf8, utf-8 and ascii, maybe others.
iso-8859-6-i is the one we hit in the wild.
The charset crate adds another three alternative labels for utf-7
x-unicode-2-0-utf-7 unicode-1-1-utf-7 csunicode11utf7