WASHINGTON — The post office forwards letters when a person moves, and telephone companies likewise forward calls. Should Internet companies be required to forward e-mails to customers who switch providers?

There is no mandate governing e-mail forwarding, and industry officials say imposing one would be costly and unnecessary. But federal regulators are looking at the issue more closely following a complaint from a former America Online customer who claims an abrupt termination of service devastated her business.

Gail Mortenson, a Washington-based freelance editor, in July filed a six-page petition with the Federal Communications Commission, which opened a 30-day public comment period that ends Friday, followed by another 30-day period for replies.

Mortenson said in her complaint that she lost potential clients because they couldn't reach her, and she requested that Internet service providers, such as Time Warner Inc.'s AOL LLC, be required to forward e-mail traffic from a closed account to a new e-mail address designated by customers for at least six months.

FCC spokesman Clyde Ensslin said he wasn't aware of previous petitions regarding e-mail address forwarding or portability.

While mainstream consumer groups have not taken up the cause, it is starting to gain some attention in Congress.

Mortenson said a representative from the House Oversight and Government Reform Committee, chaired by Rep. Henry Waxman, D-Calif., contacted her Monday to say they were watching to see how the FCC handles her complaint.

Messages left for the committee yesterday were not returned.

Internet providers, including Time Warner Cable Inc., Comcast Corp. and Verizon Communications Inc., as well as Google Inc. and Yahoo Inc., which provide e-mail services, declined to comment.

Kate Dean, executive director of the U.S. Internet Service Provider Association — a trade group whose members include AOL, Verizon and Comcast — said it will respond to Mortenson's petition, but declined to make any comments until then.

Some companies, such as Yahoo and Google, allow their e-mail users to forward incoming mail to another address. There are other companies, such as www.Pobox.com, that also provide an e-mail forwarding service.

AOL closed Mortenson's account last December soon after the company learned it was actually opened by her son several years earlier when he was a young teenager. The account was still in his name although Mortenson was paying for it.

AOL spokeswoman Anne Bentley wrote in an e-mail to the Associated Press that AOL is still investigating the facts of Mortenson's petition, but said it has "strict policies to prevent minors from creating paid AOL member accounts."