questionshow do i track down the source of magazines we…

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Set up a stakeout in view of your mailbox and see if you can catch the deliverer red-handed.

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My suggestion would be to call Shape magazine and ask who/how you got signed up.

Otherwise, perhaps someone signed you up for it thinking you would like it?

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I agree with @hackman2007. I've received free magazine subscriptions in the past from family members and also as a "preferred customer" bonus from some retail stores.

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Another vote here for a phone call or email.

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Definitely email the customer service department. You'll find the address somewhere in the Contents pages.
Same thing happened with us and Family Circle magazine. Somewhere during our online Christmas shopping last year we scored a free two year subscription that came with a purchase we made. I had to email them to find out how it happened.
Thank goodness we're not paying for it. It's a far cry from the **Family Circle" from my mother's day. Nothing but ads, touchy feely articles, diet/health fads & recipes. Oy, the advertisements. Lots of 'em. Tons. A multitude.