I own lastname.net and accordingly my email is firstname@lastname.net. Ofc. I stupidly created email accounts for my relatives with firstname@lastname.net and in the process became tech-support for my entire extended family.

You WON'T BELIEVE the amount of times I get a phonecall because they can't log into firstname.lastname.net or firstname@lastname.de or firstname.lastname.de or firstname.lastname@de it drives me crazy!