We have a website for a local alumni club to a major university (MSU). We have a list of some 300 current members and 1,700 prospective members. I am using a product called "Newsletter Manager Pro" (Npro for short) from Designerfreesolutions to generate and email the newsltters. The domain name from which the newsletters come from is "michiganstate.org" and the email address is "email@example.com". Npro is capable of doing a lot of very neat things, including sending emails out in small batches. It also reports back how many are being opened. Currently, our success rate is only about 40%. We are finding that anti-spam blockers are catching 60% of our emails and sending them to spam/jumk mail folders.
Is there anything we try to stop (or improve) the spam blockers from flagging our emails as spam?