Fellow Americans, you probably won't know what the hell this module is for.
Europeans, Russians, et al, you probably do. ':-)'.

For example, here's a valid MIME header you might get:

From: =?US-ASCII?Q?Keith_Moore?=
To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?=
CC: =?ISO-8859-1?Q?Andr=E9_?= Pirard
Subject: =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=
=?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?=
=?US-ASCII?Q?.._cool!?=

The fields basically decode to (sorry, I can only approximate the Latin
characters with 7 bit sequences /o and 'e):

From: Keith Moore
To: Keld J/orn Simonsen
CC: Andr'e Pirard
Subject: If you can read this you understand the example... cool!

*Supplement*: Fellow Americans, Europeans, you probably won't know what the
hell this module is for. East Asians, et al, you probably do. '(^_^)'.

For example, here's a valid MIME header you might get:

Subject: =?EUC-KR?B?sNTAuLinKGxhemluZXNzKSwgwvzB9ri7seIoaW1w?=
=?EUC-KR?B?YXRpZW5jZSksILGzuLgoaHVicmlzKQ==?=

The fields basically decode to (sorry, I cannot approximate the non-Latin
multibyte characters with any 7 bit sequences):

Subject: ???(laziness), ????(impatience), ??(hubris)