With Mailhardener you can monitor who uses your domain to send email. Not just the legitimate senders such as yourself, your marketing platform, or your automated emails, but also spammers and fraudsters who (ab)use your domain name to scam your customers.
We use Mailhardener for a couple of months now and it saved us a lot of headaches and rabbit hole searches on why mails didn't get delivered. It gives peace of mind that domains are monitored.
Absolutely worth the investment!
