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STARTTLS not working with Plesk email server

julmot

New Pleskian
Hello,

I've just installed a Plesk 12 vServer and created a customer with a email adress. I took the informations shown in the Power-User-Panel under "emails" with the correct ports (see screenshot below). After clicking on "finish" it shows that Thunderbird has a problem with a certificate from Plesk.
Screenshot:
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I don't want that this error message will be shown for customers. What is the reason for this? How can I avoid it?
My primary domain of the vServer has a SSL-certificate. Could I use this primary-domain to avoid the error message (the server-adress would be different)? If I use the primary domain inside the server-adress Thunderbird will say "there is no email account on this server".
 
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