How-To: Configure SSL mails connections for multiple domains on same Plesk server ?

[Samyno]

Hello,
I'm using Plesk 11.0.9 #33 on my Ubuntu Linux 10.04 server.
I have multiples virtual hosts on this server (ex. domainone.com and domaintwo.com, etc...).
I installed an SSL certificate on the Plesk panel, not using the default self-signed certificate, with RapidSSL. Now the server access is secured by this new certificate. (https://sd-xxxxx.dedibox.fr:8443 and https://sd-xxxxx.dedibox.fr:10000 for my Webmin panel)

My problem is :
When I setup an email address on a mail client, ex. Mail on Mac OSX, I have always an SSL warning because it's still the self-signed certificate witch is used for the server connection.
Mail servers are mail.[domain name].com.
How can I solve this problem using the new RapidSSL for all mailboxes connections ? (ex. one@domainone.com and two@domaintwo.com)

Sorry for my english level...

Thanks