I have a Server with Webmin, Usermin and Sendmail using pop3s. I have created a seft signed certificate using webmin. Exported it and imported it to the trusted root certification authorities on my client. This fixes the warning message from internet explorer when attempting making a ssl connection to webmin. When attempting to use usermin or retrieving mail I get that warning that this site's certificate is self signed. I look at the certificate and its not the same as the one I created with webmin. My question is. Is possible to have the same certificate be used by each?

Yeah, that's fine, it's the hostname that needs to match the certificate, so using over pop3s, https etc, it doesn't make any difference, as long as the cert is a proper server certificate like yours certainly appears to be.

Thanks for you response and you're right about the hostname because I noticed that using www.hostname.com works and hostname.com doesn't. I guest I should have created the cert with a wildcard (ie *.hostname.com) but that's another matter I'll look into.

I also discovered that webmin uses the cert located in /etc/webmin/miniserv.pem and usemin uses a cert located in /etc/usermin/miniserv.pem
I initialy re-configured usermin to use the webmin cert but changed it back and copied /etc/webmin/miniserv.pem to /etc/usermin/miniserv.pem to keep the default usermin ssl configuration.

So I have one cert on my client and my client can now connect and access webmin and usermin with out any warnings about certificates. But I still get the warning when using Outlook to check mail on my sendmail server using pop3s .. So the million dollar question is where does pop3s daemon look for its certificate?

Depends what pop3 service it is. dovecot? courier? cyrus? wu?

Im using wu I believe. I installed imap.rpm from University of Washington which includes pop3s along with other mail protocols

Hmm, well wu has a pretty poor reputation, and I'm not familiar with it's config any more. I'd recommend dovecot personally, which also has a very clear config file to point to the certificate and CA certs.

Thanks, I believe I figured it out. The certiticate is stored in /etc/ssl/imap folder. Because this server is mail.hostname.com and not www.hostname.com as you mentioned before about hostnames; I created another cert by using openssl reg -new -x509 -nodes -out ipop3sd.pem -keyout ipop3sd.pem -days 3650

Thanks for you help again