Text::Header(3pm) on Linux
The text 8dd1d2232058, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
RFC 822/2068 "header" and "unheader" functions
The text 8dd1d2232058, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
RFC 822/2068 "header" and "unheader" functions