sebbASF commented on pull request #517:
URL: 
https://github.com/apache/incubator-ponymail/pull/517#issuecomment-687812671


   I'm just working my way through the new documentation, which seems very 
thorough.
   
   There is a section in dkim_id_test.html which states that a mbox From line 
may be confused with a header. It says that:
   
   From MAILER-DAEMON Fri Jul  8 12:08:34 2011
   
   could be interpreted as a header with field name:
   
   From MAILER-DAEMON Fri Jul  8 12
   
   According to the original rfc822 and current rfc5322, header field-names 
cannot contain spaces, so it's not possible to confuse a line that starts with 
"From text...:" for a valid header.
   
   [There is an obsolete syntax that allows trailing white-space just before 
the colon, but that could not match a valid mbox header which must have some 
printable chars before the colon]


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