[imp] little pop3/notls question

[Darklord]

I want my users to check their own mail domains with th imp webmail, so they must be able to put his own server at server's dialog box, but I want the default protocol to be "pop3/notls" anuone knows where can I change it ???? 
Thanks in advance.

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Enrico Pelaggio
Tecnologia - Netgate
epelaggio@netgate.com.uy
sms@space.com.uy
+598-2-4006666