"Avalanche on Mail Mountain" {Style Plus, Jan. 28} failed to provide some tips for controlling the avalanche:

1.If a prepaid return envelope is enclosed with your junk mail, put everything you received in the envelope along with a request to have your name deleted from the mailing list. Pretty soon you will become too expensive to keep on the list, and even if your name is "Occupant," you will be dropped from the list.

2. If you buy anything through the mails, read the fine print on the order form. There is usually a statement that the company from time to time shares mailing lists with other mail-order firms unless you specifically request that it not do so. There may be a "yes/no" box to check right on the form or an address to which your "No, don't share my name" request should go. Follow through, and keep postcards handy for this purpose.

3. Magazines also share mailing lists, and they often tell you under "subscription/change of address" headings in the back pages that your name and address will not be provided to anyone else if you specifically so request.

4. If you want more junk mail, don't do anything and get a larger mailbox.

JAN BAKER WINE

McLean

The mail avalanche need not continue, at least not the cascade of nasty postcards that flip in your face and fall on your lap from magazines. These cards would disappear forever if readers did not throw them away, but instead simply dropped them into a mailbox.

Each card that's returned costs the magazine, or the encyclopedia, or the commemorative dish maker more than 25 cents in prepaid postage. Publishers and sellers can absorb this cost if the card brings in an order. But if blank cards are returned by the thousands, the cost will quickly become too great .

Readers of the world, unite! Mail back all that falling junk, and before long your laps, and your living rooms, will be litter-free.

WILLIAM LANOUETTE

Washington