Here is the definition of trademark infringement directly from USPTO [1]: "Trademark infringement is the unauthorized use of a trademark or service mark on or in connection with goods and/or services in a manner that is likely to cause confusion, deception, or mistake about the source of the goods and/or services."<p>I'm not affiliated with Postman in any way. But if I was, I'd already have sent a note to my lawyers to collect evidence, issue a cease and desist letter, get your project kicked off of github, and prepare for the possibility of lawsuit.<p>Given the nature of your project and the extreme similarity to the name "Postman", I would strongly urge you to change your project's name before you expose yourself and your family to potential financial ruin.<p>[1] <a href="https://www.uspto.gov/page/about-trademark-infringement" rel="nofollow">https://www.uspto.gov/page/about-trademark-infringement</a>