Hi, I recently read about the trick by Wietse, defining a second DNS record to skip the 450 delay that follows some postscreen tests. I modified my DNS and it looks like this now:
host -t mx roessner-network-solutions.com roessner-network-solutions.com mail is handled by 10 mx0.roessner-net.de. roessner-network-solutions.com mail is handled by 20 mx0-1.roessner-net.de. and that works. Could I also simply set a second A-RR for mx0.roessner-net.de. ? Do MTA implementations always use any A record, if one throws a 450? I looked inside smtp_addr.c to find answers (how Postfix might handle this) and saw the usage of getaddrinfo() and pointered lists and stuff; not sure if I really understood, but would Postfix use a next client IP, if one temp fails? Has the second-MX solution any advantages? Should I stay on the current setup? Thanks for bringing light :) Christian -- Roessner-Network-Solutions Bachelor of Science Informatik Nahrungsberg 81, 35390 Gießen F: +49 641 5879091, M: +49 176 93118939 USt-IdNr.: DE225643613 http://www.roessner-network-solutions.com
