Ted Mittelstaedt wrote on Tue, 09 Feb 2010 14:56:49 -0800:

> MISSING_SUBJECT,

> Now, why the message that SA is creating is getting TWO Subject: lines 
> is a different question.

because SA thinks it's got no subject, so it adds one as it is instructed 
to tag the subject. Obviously, it wants to see at least a whitespace after 
the colon to accept it as a header. I did some research on this matter some 
time ago and if I remember correctly the latest RFCs (5322, maybe 2822) 
indeed require a whitespace while older RFCs (822) were not 100% clear 
about this. And it's good practice for clients to be forgiving in the 
interpretation of received messages. Thus, Thunderbird finds two subjects 
and displays the second one. I'm sure it's not the only program that does 
that.
What SA probably should do is use the existing subject header, repair it 
with a whitespace and then tag it.
To be sure that there are really no characters (you said there are some 
unprintable characters, but it rather looks like there are no characters at 
all) you should examine that message with a hex editor.

Kai

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