SpamHero supports most any mail server for outbound email.
Filtering Microsoft 365 outbound mail through SpamHero
Using the SpamHero Smart host feature for Exchange
Set up Exim to Relay Outbound Messages Through SpamHero
Set Up Postfix to Relay Outbound Messages Through SpamHero
Configuring a Barracuda appliance to send outbound emails through SpamHero
Practically any mail server can be used with our service by either using IP based authentication or by entering your login credentials. If you have a question about how to set up your mail server, contact support.