In Intermedia Setup the account and mailboxes if not already done. Notify Intermedia that you wish the mail coming to this account should not be filtered. Intermedia will want to know the mail server addresses that the mail will be coming from. They are:

185.201.16.0/22, 185.201.16.0/24, 185.201.17.0/24, 185.201.18.0/24, 185.201.19.0/24

Solar Winds: The MX records for the account should be changed to point to Solar Winds at:

mx1.mtaroutes.com (10), mx2.mtaroutes.com (20), mx3.mtaroutes.com (30,) mx4.mtaroutes.com (40)