Hi all I've did the ubuntu 12.10 setup with dovecot and apache from howtoforge.org. I want to filter following with a custom rule in sieve. I want to to following: If not "mail.xy.net" in the header, redirect to the email [email protected] I've created following rule: if not header :contains "received" ["mail.xy.net"] { redirect "[email protected]"; } May in the sieve log is following: main_script: line 5: error: the header test requires 2 positional argument(s), but 1 is/are specified. main_script: error: validation failed. error: the header test requires 2 positional argument(s), but 1 is/are specified. Has somebody an idea how I can fix it? Thx admins