mimedump (1) - Linux Manuals
mimedump: dump out the contents of a parsed MIME message
mimedump - dump out the contents of a parsed MIME message
DESCRIPTIONRead a MIME stream from the stdin, and dump its contents to the stdout.
mimedump < mime.msg
AUTHORAndreas Koenig suggested this, and wrote the original code. Eryq perverted the hell out of it.