Your prospects check their mail the same way you do. They scan each envelope to determine if it’s a bill, junk mail, or something worth their interest. Everything from the envelope, to the stamp, to the address determines whether or not your mail piece will pass this test.
Your mail piece should stand out from everything else. It should be appealing and intriguing to your potential customer. When your envelopes are hand-addressed and stamped by real people, it is guaranteed to have the personal touch that makes others curious and excited to open it. In a stack of their everyday mail, they will not just open it, they will likely open it first.