On Tue, January 6, 2015 12:41, Roman Gelfand wrote: > 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?
Suggestions: Is the 'slow' host running a dns service (caching only or otherwise) itself? How is the resolver set up on the slow host? If you run dig on the slow host are the requests for the incoming fqdns serviced any faster than by postfix? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:byrn...@harte-lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3
