How to set the particular domain link in the email which is sent by "Forgot your password" form at https://example.com:8443/get_password.php ?
There is no way to configure what link will be provided for restoring password in Plesk, the link will be generated basing on the domain that used for resetting password procedure.
As an example, the email will contain the link like https://example.com:8443/ch_pass_by_secret.php?secret=xxxxxx if the new password was requested using the following link https://example.com:8443/get_password.php.
The email will contain the link https://localhost:8443/ch_pass_by_secret.php?secret=xxxxxx if the password was requested at https://localhost:8443/get_password.php.
Take part in our product improvement by requesting this feature using the following link: https://plesk.uservoice.com/forums/184549-feature-suggestions
The top-ranked suggestions are likely to be included in the next versions of Plesk.