Thanks for your email. Yes, I looked before at that website before. I'm using these options with Dovecot 2.1.8, among others:

auth_ssl_require_client_cert = yes
ssl_verify_client_cert = yes
ssl_ca = </etc/ssl/certs/cacertcrl.pem

On 28.06.2013 23:34, Reindl Harald wrote:

Am 28.06.2013 23:31, schrieb Ireneusz Szcześniak:
I've been using Dovecot 2.1.8 on OpenBSD 5.2 i386 for about a month. It works 
great.  Dovecot serves IMAPS only,
and I'm using Thunderbird to access my mail.

I configured Dovecot to allow clients that present a valid certificate when 
establishing SSL connection.  I
configure my Thunderbird for SSL/TLS connection with normal password.  It works 
fine.

However, with my config anybody can connect to my server without presenting a 
certificate

google "dovecot ssl client certificate" leads to
http://wiki.dovecot.org/SSL/DovecotConfiguration

well, this is for dovecot 1.x, but have you tried it?

Client certificate verification/authentication
If you want to require clients to present a valid SSL certificate, you'll need 
these settings:

ssl_ca_file = /etc/ssl/ca.pem
ssl_verify_client_cert = yes
auth default {
   ssl_require_client_cert = yes
   ..
}

--
Ireneusz (Irek) Szczesniak
http://www.irkos.org

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