email certificates

[W Scott Lockwood III]

On Wed, Jul 27, 2016 at 10:54 AM, Bob <livingsky at gmail.com> wrote:
> Does anyone know where/if I could get an ssl cerficate for postfix/dovecot
> that is signed and free? I have generated my own unsigned one, but some
> users want to use gmail to retrieve their mail and it doesn't accept
> unsigned certificates.

Have you tried https://letsencrypt.org/ ?