[stunnel-users] feature ? authorizing only given certificates ?

[fmgre-dell at yahoo.fr]

Hello
My european organization is using a certificate chain which signs tens of thousands of user certificates.
My local organization counts 300 users ...  and i only want these 300 to get in the IT system.
I'd like to know if there is a way to restrict the connection to a subset of certificates ( for example based on a list of authorized emails which are written in the certificate ) 

Sincerely 
Fred 
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