We collect e-mail addresses on our tenant info form at move-in. Our accounting software(WinSen) automatically generates late notices that are instantly e-mailed to tenants. As we have an online payment option, often tenants will see their late notices and pay online immediately. Our overall delinquency rate is seldom over 10%; 5-8% is average. Part of this is because we are located in an affluent area; however, I think that the e-mailed late notices are a big part of our success in maintaining a low delinquency rate. We still send out the notices via regular mail to remain in compliance with state lien laws.