[Dovecot] ssl_require_client_cert = yes for encrypted connections only

[Rainer Frey]

Hi,

is there any way to get dovecot to use "ssl_require_client_cert = yes" 
for encrypted connections only? For unencrypted connections there can't 
be any client certificate, and I can't disable unencrypted connections 
altogether (I limit them by firewall to our own network).

Rainer Frey
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Software Development
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