[Dovecot] TAB characters in subject header continuation/wrap lines

[John Peacock]

Stephen Warren wrote:
> My question is: Should Dovecot be detecting mail header continuation
> lines that start with a TAB, and stripping the TAB (converting to a
> space)? 

No.  Dovecot should not alter the message at all.  There is an older bug 
in bugzilla about this; it is the MUA that is at fault here.  The 
leading tab is FWS (Folding White Space) and can be added by clients 
(Exchange is particularly prone to do this) and should be ignored by 
everything up to and including the local MUA.

> Is there an issue in mailman - should mailman be indenting with e.g. a SPACE
> character, or is mailman's action perfectly legal?

Not just legal, but if the subject line would exceed 998 characters 
(plus CRLF) it is required that the individual lines be wrapped.

HTH

John


-- 
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
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