If you use an envelope template you can have any return address you wish
including an address pulled from the data file. See also
http://www.gmayor.com/Alternative_Return_Addresses.htm. There's a sample
envelope template for download from my web site which can easily be adapted
to your requirements if you don't fancy starting from scratch.

Signature
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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> We include return envelopes in our mailings and would like to have the
> clients' address as the return address. Is there a way I can set up
> a mail merge where the return address is different for each envelope?