[Users] OT: BUG with update marking all email as "read"

[Ralf Mardorf]

PS: In addition you likely break filter rules, as you did for my
Evolution's filtering, because if you use Cc, I only receive a mail
without header. Without the mailing list header, the MUA can't
distinguish between office mails and mailing list mails send to my
address, resp. it's sorted to an office folder, instead of the Claws
folder.