Is it possible to configure button Open webmail for this email address in new browser window
in Customer Control Panel to use particular hostname like
https://webmail.hosting.tld for all customers instead of
example.com is the customer domain?
Unfortunately, there is no such option in current Plesk Automation implementation. Internal request in order to implement this functionality has been registered with id #PPA-2505.
The fix is considered to be included in one of the next PA updates.
Please use provided ID to track maintenance in Plesk Automation release notes.
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As a workarund you can create custom button with link to required address for webmail users, as described in the article