At hostaachen.de you can order your special and own domain name for your email traffic. Especially for (small) companies it looks dubious to use an address by one of the freemailers like mybusiness@gmail.com.
What you need to do first is reserve a free domain name. Secondly you can book an email package or if you also want to make your own web page you are better off with a webhosting package. With a webhosting package you can both use email and make a website with your reserved domain name.
As an example:
Imagine you reserve the domain
Together with an email package you will be able to create your own email addresses like
The amount of email addresses and the features are bound to the package you choose.