how to configure sieve to start STARTTLS ?

[JOYDEEP]

Dear list,

after implementing the imaps , I need to configure sieve to start STARTTLS.

sivtest -a aftab  -u aftab   linux.kolkatainfoservices.in  -m LOGIN  -t
""

is working well. is there any config file for sieve so that I can force
sieve to start STARTTLS ?  bcoz  I am using sieve from a web-based email
client called felamimail.

thanks

----
Cyrus Home Page: http://cyrusimap.web.cmu.edu/
Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html