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POP3 SSL connection uses localhost security certificate

Freddie Bleiweiss

Basic Pleskian
I have numerous customers using Thunderbird and Eudora mail clients. When signing on to either retrieve or send mail (SMTP Authentication) they receive the following message.

"localhost" is a site that uses a security certificate to encrypt data during transmission, but its certificate is expired on 09/17/2009 9:28 PM."

Every domain on the server has a self-signed certificate. The email clients all use FQDN's (mail.domain.com) to specify the mail server.

I am puzzled as to why the correct domain certificate is not being offered. Any ideas on how to resolve this problem?

Using RedHat Linux 2.6.9-89.0.16.EL, Qmail and Plesk 9.2.3
 
Make sure that IP address of domain is shared. So, certificate should be installed to and assigned from repository of domain but not from administrator's one (Server -> Certificates).
 
Web server certificates are different than mail server certificates. You need separate ones. You can do a self signed cert for qmail - just look around for steps. It's straight forward.
 
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