jason rennie jrennie ai mit edu writes my sysadmins have told me that the sending mail client is supposed to escape lines begining with from exmh NUMBER NUMBER doesn t do this should it it appears that my mh is mh NUMBER NUMBER does nmh fix this actually this issue used to escalate into a religious war the from envelope is an artifact of the mbox mailbox format and from that perspective it should be the mail server that stores its mailboxes in mbox format that should be responsible for escaping lines beginning with from on the other hand this breaks the assumption that the mail transport only touches the message headers and leaves the message body alone things like pgp signatures break when the mail server changes the message body also strictly speaking the mbox format envelope or for us old timers the uucp envelope isn t just any line beginning with from it s really from a single space a valid email address two spaces and a valid date for example from ptardif URL sun jul NUMBER NUMBER NUMBER NUMBER NUMBER john abreau executive director boston linux unix im jabr URL abreauj aim abreauj yahoo NUMBER icq email jabr URL www URL pgp key id NUMBERxdNUMBERcNUMBERbNUMBERdNUMBER pgp key fingerprint NUMBER fb NUMBER NUMBERf NUMBERc NUMBERb dNUMBER NUMBERb eNUMBER cNUMBER NUMBERa NUMBERe fNUMBER NUMBERc be NUMBER some people say the enemy of my enemy is my friend i often respond when elephants fight it s the grass that gets trampled 