Printing both addresses on envelopes

[Matt Pitschman]

I am starting a direct mail campaign. I started with a list of owners, mailing addresses and property addresses in excel. I then created a word doc with the mail merge to have the same return address on every sheet and a different mailing address on every sheet. I have 350 properties on my list and I am using a font that looks like handwriting. I would like to print these on A2 invitation envelopes that are 4.375" X 5.75". I have my doc formatted for this size. I cannot find anyone to print these for me. I talked to the Fedex store, OfficeMax, and Office Depot. And chatted with someone from Vistaprint. They all say their printers are not suited for envelopes and will jam. Does anyone have any suggestions? My printer is old and would not work well, or else I would try that. I am in the process of trying to find something else online. Thank you.