istream-tee: Fixed to work right when input stream didn't start from offset 0.
istream-tee: Fixed to work right when input stream didn't start from offset 0.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot