The standard Unix mailbox format is called mbox
From email@example.com Sat Nov 27 22:13:37 2004 Return-Path: <firstname.lastname@example.org> Delivered-To: email@example.com Received: (qmail 4225 invoked by uid 119); 27 Nov 2004 22:13:37 -0000 ... I like pie
From firstname.lastname@example.org Sat Nov 27 22:18:39 2004 Return-Path: <email@example.com> ...
This is a really crappy format
What if two MDAs try to deliver messages at the same time?
What if the MDA crashes partway through delivery?
What if the message contains a line that begins with From?
What if the message does not end with a blank line?
qmail will deliver in this format anyway, but it's not reliable
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