[Dovecot] sieve rule help

[Piyush Joshi]

Dear All,
               I am using dovecot-2.0.0 version and all my sieve
filters are working perfectly except the following one.

I am trying to flag message coming from jagdish at example.net mail id.

require ["fileinto","envelope","reject","vacation","imap4flags","relational","comparator-i;ascii-numeric","regex","body","date"];

if address :contains "From" "jagdish at example.net"
{
keep :flags ["Flagged"]  ;
}

Is it possible to make it work without using addflag to add a flag ?