Trademark Infringement Question

[Luke Moses]

I just received a letter from Neal & McDevitt, intellectual & marketing attorneys. They say that my business name "Principal House Buyers, LLC" raises a likelihood of confusion for Principal Financial Services Inc and Principal Life Insurance Company and many others. Evidently they are registerd in Des Moines, Iowa and I am in Texas. I did a name search with the secretary of state before opening my LLC in the state of Texas and was given the green light.

They are requesting detailed information regarding goods and services offered.

Exact dates for use of "trade name."

The geographic extent of use of "trade name"

Samples of advertising...

Should I respond to this letter or be concerned or are they just saber rattling?

[David Dachtera]

Contact your own attorney.