I have a domain I've used pretty much just for email for the past 25 years. The domain is similar in a kinda h4cker l33tsp34k way to the name of a SaaS that sta

I have a domain I've used pretty much just for email for the past 25 years. The domain is similar in a kinda h4cker l33tsp34k way to the name of a SaaS that started up about 8 years ago and offers a free trial. Now I get multiple emails a day due to people being clever and using their made up name @ my domain for their test accounts. It was hard to filter it at first since people kept exploring areas of the trial that generated novel message templates and the messages seemed to come from an endless supply of unique hosts. At one point I contacted the SaaS company about it but they told me there was "nothing they could do" even when I promised I was the only user at that domain and I had no intent to sign up to their service with it. I used to just log into their trial and delete the account, but while trying to automate this I figured out a better way to do my filters so the emails don't really bug me anymore (except in the cases when someone picks an alias I already have in use).