Hi,
there is a problem between Dovevot 1.2 Managesieve 0.11.7 and Horde webmail 1.2.2 (possibly also in 1.2.3) in imap4flags
"sieve_extensions = +imapflags will enable the deprecated imapflags extension in addition to all extensions enabled by default." <http://wiki.dovecot.org/LDA/Sieve/Dovecot> Cheers, Thomas
