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My other suggestion is to try glabels see here for some ideas: http://blog.worldlabel.com/2010/advanced-usage-with-glabels-labelscards-linuxgnu.html, glabels is a program designed mainly for labels, business cards and so on but custom layouts can be made with it so I think you could make a template for envelopes, its description says it supports mail merge from sources such as CSV files, vCards an
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