Can't delete stats site

I'm trying to delete a stats site for a domain and I get this error:

Error : 72300280 : The currently selected Mail Server is not supported.

Not sure why I'm getting some sort of mail server error when I'm trying to delete a stats site?

I am not getting such error in my HC panel ( HC7 Build version= 15 )

We need to check this issue in your panel. Please send a ticket on HC support with your panel access and stats site name. Thanks

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