Self-Signed Certificate issue

Joseph Tam jtam.home at
Sun Sep 25 22:21:58 UTC 2016

Darryl Baker writes:

> I am running a small email site which I am moving from uw-imapd and Solaris
> to Ubuntu and Dovecot imaps and pop3s. I am trying to use a self-signed
> certificate for this site. I am using Thunderbird as the test client. I've
> tried both the pre-built snakeoil certificate and building a special one
> for dovecot. In /var/log/mail.err I keep getting what I am interpreting as
> a missing CA cert. The message is:
> dovecot: imap-login: Error: SSL: Stacked error: error:14094418:SSL
> routines:ssl3_read_bytes:tlsv1 alert unknown ca: SSL alert number 48
> The certificate was created by:
> openssl req -new -x509 -days 365 -nodes -out /etc/ssl/certs/dovecot.pem
> -keyout /etc/ssl/private/dovecot.pem

Are you using this as a server certificate or as a client certificate?  Please
output your dovecot's configuration, esp. your SSL setup.

 	doveconf -n | grep ssl

Joseph Tam <jtam.home at>

More information about the dovecot mailing list