2 client machines connect via telnet to postfix smtp server on port 25. All machines are on the same subnet. One machine gets helo instantaneously. The other it takes roughly 20-30 secs. I had similar problem in the past where dns reverse resolution was problem. However, here there is reverse resolution. Would anyone know what else it could be? Also, assuming it is a dns problem, is there a dns command(s) used to troubleshoot this type of problem?
Thanks in advance
