sieve rejects to cyrus@domain.com instead of sender

[Justin Albstmeijer]

My reject rules in sieve send there reject reply message to
cyrus at domain.com instead of the original sender.

Any idea what the problem could be?

--- sieve script --
if

header :contains "From" "domain.com"
{
reject text:
Please do not send me mail.
.
;
}
-------------------

software versions:

postfix-1.1.12
cyrus-imapd-2.1.9


Justin