by adamka » Mon Apr 04, 2011 11:04 pm
Just because a name doesn't show up in a database (in addition to the Federal Trademark Database, States mainting registries as well) it doesn't mean that trademark isn't owned by someone else. Use of the name, not registration of the name in a database, is what creates ownership of a trademark.
A trademark has to be used publicly to identify goods or services for sale. So the name of the business, product, or service in public in conjunction with something you're trying to sell, it isn't considered a trademark.
Unlike copyrights, trademarks don't give the same amount of protection to the to everyone; the level of protection depends on how "strong" the mark is as well as other factors including whether or not you are competing with the other business.
Without knowing the details, I would guess that you are safe to keep your e-mail address since you are not offering a competing product or service (for example, Ford Motor Company and Ford Modeling Agency share similar trademarked names, yet no one would confuse the two, so neither can claim financial damages from the confusion of the two). However, lawsuits can be costly...even if you win...it may be easier to choose another address to avoid the situation entirely.
Trademark: Legal care for Your Business & Product Name by Stephen Elias, published by Nolo may be a good resource to read up on some of the details. Consulting with an Attorney is always a good idea if you are being threatened with legal action.