Connect Stunnel client to SSL MySql Server (without Stunnel Server)

[Area sistemi Ripartizione Informatica]

I tried to connect my workstation (with an installed stunnel client) to a MySql Server SSL enabled, but MySql Server abort this connection.

The standard mysql ssl connection works:

mysql -h <server_name> -u <user_name> -p --ssl-key=<path>/client-key.pem --ssl-cert=<path>/client-cert.pem

Stunnel connection doesn't work:

mysql -h 127.0.0.1 -u <user_name> -P 3307 -p --ssl-key=<path>/client-key.pem --ssl-cert=<path>/client-cert.pem

with stunnel.conf:
-------------------------------------
client = yes

pid = /etc/stunnel/stunnel.pid

debug = 7
output = /var/log/stunnel/stunnel.log

TIMEOUTclose=10
sslVersion = all
#options = NO_SSLv2

[mysqls]
accept = 127.0.0.1:3307
connect = <server>:3306
----------------------------------

(I tried with or without "options = NO_SSLv2")

I ask for your help to find what is wrong.

Thanks