I have:
I want to user my VServer as an external Mailserver. But i don´t know what to write in the "CName (Alias)" and "MX (Mail Exchanger)".
And where do i have to point my imap.server.tld and smtp.server.tld in my Emailclient? to imap.plesk-vserver.tld or to imap.my-regualar.tld
What´s about the origin of my emails i send out? Do i need to configure Plesk as well?
Here how to Receive emails on Plesk server:
Assume that your "Domain (GoDaddy)" = domain.tld
In "Domain (GoDaddy)":
Where 1.2.3.4 - it's IP of your plesk server
In Plesk create new subscription or new add-on domain with name "domain.tld"
Point your email client for IMAP on IP address of Plesk server.
To Send emails from "Google Cloud Engine" I recommend to use some external service like SendGrid / MailChimp or change your application to send mail via SMTP on Plesk server.