Did I get hacked? Concerning mail from mailspring...

Hi all!
Today I received the following mail:

"This is an email sent by Mailspring while we were testing your account config.

As you've received it, everything must be a-ok.

Kind regards,

The Mailspring Team

P.S. a massive thank you for using Mailspring. We'll love you always!"

The strange thing is: the sender was me = my own mailadress. I do not have an account at mailspring nor do I know what it is. Pretty concerned to be honest.

My antivirus program hasn't found anything on my pc.

Has someone received something similar in the past?
Any ideas where this comes from or tips what I should do now?

Thanks in advance!