GOOD
("Subject: Notification d'+AOk-tat de remise (+AOk-chec)","utf-7","iso-8859-1")
Subject: Notification =?utf-7?Q?d=27+AOk-tat?= de remise
 =?utf-7?Q?(+AOk-chec)?=

GOOD
("The next sentence is in GB.~{<:Ky2;S{#,NpJ)l6HK!#~}Bye.", "hz")
The next sentence is in
 =?HZ-GB-2312?B?R0Iufns8Okt5MjtTeyMsTnBKKWw2SEshI359QnllLg==?=