www.wysiwygwebbuilder.com

Every time I buy a new version of the program for several years.
Now I got an offer via email for a discount but between spam and from the somewhat strange email address:

wysiwyg-web-builder@ionos-98d00713f.sendserver.email

Is this a valid email address or maybe it's an attempt to get credit card information?

I got the same. I think it's legit.

I don't know. I'll wait for Pablo's answer.

The email is valid, but I agree that is a confusing email address. Sorry about that.
I wanted to try something new with the mailing list feature on the web host (ionos), but unfortunately, it didn't meet my expectations as it turned out to be less effective than I had hoped.