Be able to disable/hide Mail Forwarding
Mail forwarding, when sent externally, can cause IP reputation issues due to forwarded spam.
When users setup an email account via Plesk panel, they are given the option to "Switch on mail forwarding". It would be nice to either disable or hide this option from plesk panel. If
that's not possible, then only offer users to forward email locally instead of forwarding to external email accounts

Could you clarify that we correctly got the case:
Plesk Admin wants to prohibit an ability for their customers to set up an email forwarding to external emails.
If yes, would it work if the related subscription will have additional permission, which will allow/disallow to manage mail forwarding at all for a particular subscription?
SE
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Anonymous commented
Hi, thank you. Ideally it should offer Plesk Admin options under Service Plan to do the following:
1. Service Plan option to enable/disable Email Forwarding
If Email Forwarding is enabled in Service Plan, then Plesk Admin can select from the following sub-options:
A. Allow only local domain e-mail forwarding,
B. Allow unrestricted domain forwarding (current plesk behavior)The above would allow Plesk hosters to better manage their mail server IP reputation which can be negatively impacted by external email forwarding.