The legal firm is basing its claim upon a section of the Utah statute and on the result of a similar case upheld in Washington State. The law requires any sender of a commercial e-mail to state its legal name, street address, Internet domain name and to include a no-cost way of requesting that no more e-mail be sent. The first four characters of the subject line must also read "ADV:".
Sprint has violated this section of the code, the company said in its statement. However, no one at Sprint was available to comment on the specifics of the offending e-mails.
The statute came into effect from 6 May and was designed to stop spam.
However, a statute is not self-executing and needs legal action to enforce it, the company said in its statement.
Travis Sowders, Sprint's manager for state, legal and regulatory issues said Thursday that he had only just become aware of the issue himself and was unable to comment.