timsieved logon problem

Fri May 2 05:45:15 EDT 2008

Reading another message about the thunderbird sieve extension I too did a
telnet request (normally telnet does not listen ;-)

$ telnet yanta.nagual.nl 2000
Trying 192.168.11.35...
Connected to yanta.nagual.nl.
Escape character is '^]'.
"IMPLEMENTATION" "Cyrus timsieved v2.3.11"
"SASL" "PLAIN OTP LOGIN DIGEST-MD5 CRAM-MD5"
"SIEVE" "comparator-i;ascii-numeric fileinto reject vacation imapflags
notify envelope relational regex subaddress copy"
"STARTTLS"
OK

So, timsieve IS there. Why on earth does it not listen anymore to a
request from my Squirrelmail? Is it an authorization matter after all? Has
something changed from xx.9 to version xx.11?