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During research, we have found that the request is about passing emails via intermediate mail gateway (which works as an anti-spam solution) and the idea of the request is do not check SPF for these emails on Plesk side.
In Plesk, there is already exist a solution for that: need to use "SPF Local rules" setting to configure an SPF record which will be used by Plesk to validate emails (including emails from an intermediate anti-spam solution). See KB article for mode details (https://support.plesk.com/hc/en-us/articles/360022753174) and Plesk documentation.
If it does not solve the issue on you Plesk environment and you still need the "IgnoreHost" option, let us know more details about you case for that in comments below.
An error occurred while saving the commentWanderley Frias commented
When there is a match between "Return path" and "From" in the email headers, it is considered Spam; currently it can only be fixed with the proposed workaround: https://support.plesk.com/hc/en-us/articles/115002769014
I ask that it be possible to put the domains that apply in the whitelist so that it is delivered to the inbox.