disable starttls, ssl only

[Gabriele Bulfon]

Hi,
is it possible to disable completely the starttls option on cyrus imapd?
I want just connections on 993 over ssl, no starttls at all.
I noticed a number of  "Fatal error: tls_start_servertls() failed" and noticed a slow down of the entire machine during these errors.
I wouldn't like to have some kind of ddos attak using starttls on 993 or something.
Gabriele
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