Support linking multiple parent nodes to single mail node
As a web-hosting provider, I would like to be able to link multiple parent nodes to single child mail nodes.
Although I don't know the motivation for the current only 1-to-1 Parent-Mailnode limitiation, I think cPanel should not consider only what they stand to benefit from this limitation. cPanel license alone is not a factor for deploying servers for shared hosting. There are serveral other costs that come into play.
If I have a lot of unused storage space on mail node server, it should be possible for me to link another parent so that they can share the unused storage. This makes sense for a business, especially with the yearly cpanel license price increase policy, you should also take into consideration this feature as a way for a web host to offset the increase in your license cost in other areas like server costs.