I have just recently received a kind of informal cease and desist letter (only a couple of lines, no laws quoted, not even addressed to my full name) from a big messaging company.

I'd like to understand if what the company is claiming is legit.I hope you can help me with this.

Here are the facts:

Here are the full facts:

- I bought a domain name consisting of a popular messaging app name, and the generic word "groups" (.com). For example: telegramgroups.com or groups-for-telegram.com where Telegram is one messaging app.

- As soon as I registered it, I started hosting just a simple forum on it, for people to exchange their contacts for that messaging app in order to let them find likeminded people for creating chatting groups on that messaging app.

- The domain name includes the messaging app name but the forum makes it clear that the users could exchange any other kind of contacts they wanted too (other messaging services).

- I put a couple of Google Ads on the forum, not related to any messaging apps at all.

* Being a bit naive on legal matters (don't laugh please), and thinking I was not doing anything wrong, I contacted the messaging app directly, asking if it was ok if I used their name in a Google Ad-Words Campaign to advertise my website on Google. Shortly after that, I received an informal short email from the company, telling me that I was not allowed, and that I should also immediately stop using the domain name too, because it's representing a trademark infringement.

- I am from Europe, The messaging company is based in the U.S., and the hosting-provider/domain-name-registrar is based in Canada.

So what do you guys think? I'd love to hear your opinions. I apologize if this was so long and I thank you already for having followed me till here.

Thanks a lot.