I am looking into using Sieve, we have been using the filtering in the Exim MTA until now on our Cyrus IMAP server. There seems to be some small problems with the Cyrus lmtpd + Sieve combination in our environment, where everyone uses 8 bit characters.
Unlike the Sieve vacation command the reject command does not seem to support any :mime option. Thus, if a message is rejected by a Sieve reject command the report returned may well contain 8 bit characters, yet there is no Content-Type header for the text segment of the report sent by lmtpd. As far as I can see such headers are allowed by RFC1892 - is it likely that anything will break if I hack lmtpd.c and add a header like this for the first text segment of the rejection report? : Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Would UTF-8 be a better choice? -psi
