Sieve issue with Cyrus on RHEL4

[David Chait]

All,
    I am seeing some rather odd behavior on my RHEL4 based cyrus install 
with regards to sieve filtering. Basically I can create a filter to move 
or delete mail without issue, however if the rule requires an email 
response such as a vacation message, it fails. Has anyone else seen this 
sort of thing before?

System:

Quad proc Dell 2950 running RHEL4
SMTP/LMTP: exim-4.43-1.RHEL4.5
IMAP: cyrus-imapd-2.2.12-3.RHEL4.1
Kernel: 2.6.9-42.0.3.ELsmp

Any insight would be helpful.

Cheers,
David Chait