Hopefully you have already fixed your problem here, but for others who may experience the same problem I am posting in hopes it will help as I had this exact same problem showing in my logs. After many hours of searching and coming up empty I finally noticed that in my SMART_HOST statement I had made it without the brackets around my ISP mail server. Once I put the brackets in it finally worked and the relay=[127.0.0.1] [127.0.0.1] log entries disappeared . Note I am NOT using the brackets in my AuthInfo statement (putting them in and taking them out was one of many attempted fixes) and it is currently working. To bracket or not to bracket...that is the question!
One Solution to This
Hopefully you have already fixed your problem here, but for others who may experience the same problem I am posting in hopes it will help as I had this exact same problem showing in my logs. After many hours of searching and coming up empty I finally noticed that in my SMART_HOST statement I had made it without the brackets around my ISP mail server. Once I put the brackets in it finally worked and the relay=[127.0.0.1] [127.0.0.1] log entries disappeared . Note I am NOT using the brackets in my AuthInfo statement (putting them in and taking them out was one of many attempted fixes) and it is currently working. To bracket or not to bracket...that is the question!