Do not afix these to the envelopes, just send them so the sorter can use them to provide sufficent postage for the number of cards you get each month. If you want the sorter to wait until you have a certain amount of cards before sending, please note this number on your envelopes. Don't forget the extra postage. Click here to view a proper SASE . Smaller size envelopes tend to get lost in the sorter's files and many DX cards are larger than will fit in a letter size envelope.
Larger envelopes are especially difficult to file and require additional postage.
Please furnish printed or typed labels with your current address if you choose this option . Keeping more than that on file for one ham puts a burden on the sorter's filing system. This practice just perpetuates a cycle of the sorter needing to notify you to send more. Most sorters will not allow several months to pass without making a mailing to you if you have any cards at all. This is why you may receive an envelope with only 2 or 3 cards in it from time to time.