[Dovecot] IMAPS: Disable SSL connection without client certificate

Reindl Harald h.reindl at thelounge.net
Sat Jun 29 00:34:50 EEST 2013

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

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

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