When I send postcards to my children, I usually put them all in one greeting card-sized envelope to mail to KC--it saves on postage, and leaves the entire back of the cards for me to write/draw/add stickers.
I imagine there are many, many ways it can be accomplished, but here is what I do:
On the section where you would normally write the recipient's address on the card, I like to do the child's full name in pretty script and colors, accented by stickers or little flourishy doodles. I try to stick their child ID number somewhere inconspicuous on the card. I don't write my account number on postcards.
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OR
If I have a longer message to write that will take up the entire back side of the card, I simply write "Dear Anna Marie, Blah blah blah blah, With Big Hugs, Shannon" and I write her child ID number in one of the corners (usually not above the printed text on the card, but that's because I write the date there).
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I haven't had any trouble at all with my postcards being delivered using either of the above options.
david2051 will probably have some tips and tricks to share--he sends postcards even more frequently than I do! =)
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