Hi Matias,
The short answer is No, none of our servers have been compromised.
I had a look at the log file for incoming email to you over the last few hours ... a very small section of it is;
cole@lundblad.com
coleman@lundblad.com
conner@lundblad.com
cook@lundblad.com
cooper@lundblad.com
cox@lundblad.com
cqha4cyhgeaaaaa@lundblad.com
craig@lundblad.com
crawford@lundblad.com
cross@lundblad.com
cruz@lundblad.com
As you can see, someone is simply running through typical names, and seeing if they arrive or not. If you send a read receipt or anything for any of them - they know they have a live address.
I would suspect that is the cause - although ipcheck may of course be selling on your email address - I don't know about them.