Dear all, l new here, l not very know about Reverse DNS problem. my smartelmail version is 13, so far l using almost a year and not any problem at all. But recenty when l send out one mail to my customer it show that my mail server don't have Reverse DNS,so the mail cannot send out to that cusotmer, the others is working Find.
Anyone here can tell me how to setup Reversa DNS in step by step. so far my dns alreday got mx record.
thank you in advance.