Timo Sirainen wrote: > But I'm not sure if I should convert the following TAB to a space. > UW-IMAP seems to do that, but RFC just says that the CRLF should be > dropped. As pointed out in https://bugzilla.mozilla.org/show_bug.cgi?id=240924#c7, this could lead to strange behaviour. So I'd vote for replacing the folding tab to a space.