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Yes, we had someone submit a bug report on the roundup 
users mailing list because someone had sent a message to 
the roundup mail gateway which was split. The client was 
extra-specially broken, since it split in the middle of a 
word (which is not to spec), but the more general case of 
folding on whitespace will cause roundup problems since I 
hadn't expected there to be any newlines in the header.

I can modify roundup to strip out the newline, but it'd be 
nice to have rfc822.Message not put it in there...