On Sun, 2014-10-05 at 12:51 +0100, Dennis Davis wrote: > On Sat, 4 Oct 2014, lee wrote: > > > Is the Subject: header required by some RFC? If it is, I'll also > > deny messages that don't have one. > Not as far as I'm aware. RFC5322, "Internet Message Format", > contains: > > The only required header fields are the origination date field and > the originator address field(s). All other header fields are > syntactically optional. More information is contained in the table > following this definition. There is a real difference between the lack of a Subject: header and a present but empty Subject: header. I reject emails with no Subject: headers but accept empty Subject: headers because even I can occasionally forget to type-in a Subject. -- Regards, Paul. England, EU.