On 11/5/2013 12:15 AM, George Adams wrote: > We're using Postfix 2.1.5 on an old Debian 5 Linux system ...
If Postfix 2.1.5 then your Debian install is MUCH older than Lenny (Debian 5). IIRC Lenny shipped w/Postfix 2.5.5 and Etch shipped w/2.3.8. Which means you're running Sarge (3.1) or older. Sarge was released in June 2005, over 8 years ago. You just might want to consider upgrading that box. There have been just a few improvements to both Debian and Postfix in the past 8 years. > Mail from m...@companya.com to m...@companya.com: DISAPPEARS ... > Nov 4 17:35:48 www postfix/smtpd[10453]: > warning: smtpd_peer_init: 107.14.166.225: > hostname cdptpa-outbound-snat.email.rr.com verification > failed: Name or service not known These are warnings, not REJECTs. This hostname resolves to more than two dozen addresses. This is the cause of the warning, as Postfix does not traverse this entire list looking for a match, at least 2.1.5 does not, not sure about recent versions. You really need to upgrade, both Debian and Postfix. ~$ host cdptpa-outbound-snat.email.rr.com ;; Truncated, retrying in TCP mode. cdptpa-outbound-snat.email.rr.com has address 107.14.166.253 cdptpa-outbound-snat.email.rr.com has address 107.14.166.252 cdptpa-outbound-snat.email.rr.com has address 107.14.166.254 cdptpa-outbound-snat.email.rr.com has address 107.14.166.238 cdptpa-outbound-snat.email.rr.com has address 107.14.166.237 cdptpa-outbound-snat.email.rr.com has address 107.14.166.243 cdptpa-outbound-snat.email.rr.com has address 107.14.166.251 cdptpa-outbound-snat.email.rr.com has address 107.14.166.248 cdptpa-outbound-snat.email.rr.com has address 107.14.166.234 cdptpa-outbound-snat.email.rr.com has address 107.14.166.246 cdptpa-outbound-snat.email.rr.com has address 107.14.166.244 cdptpa-outbound-snat.email.rr.com has address 107.14.166.229 cdptpa-outbound-snat.email.rr.com has address 107.14.166.233 cdptpa-outbound-snat.email.rr.com has address 107.14.166.227 cdptpa-outbound-snat.email.rr.com has address 107.14.166.235 cdptpa-outbound-snat.email.rr.com has address 107.14.166.239 cdptpa-outbound-snat.email.rr.com has address 107.14.166.250 cdptpa-outbound-snat.email.rr.com has address 107.14.166.242 cdptpa-outbound-snat.email.rr.com has address 107.14.166.249 cdptpa-outbound-snat.email.rr.com has address 107.14.166.232 cdptpa-outbound-snat.email.rr.com has address 107.14.166.247 cdptpa-outbound-snat.email.rr.com has address 107.14.166.245 cdptpa-outbound-snat.email.rr.com has address 107.14.166.231 cdptpa-outbound-snat.email.rr.com has address 107.14.166.226 cdptpa-outbound-snat.email.rr.com has address 107.14.166.241 cdptpa-outbound-snat.email.rr.com has address 107.14.166.230 cdptpa-outbound-snat.email.rr.com has address 107.14.166.240 cdptpa-outbound-snat.email.rr.com has address 107.14.166.225 cdptpa-outbound-snat.email.rr.com has address 107.14.166.236 cdptpa-outbound-snat.email.rr.com has address 107.14.166.228 To see if you're actually rejecting these, search for rejections, i.e.: ~$ grep 107.14.166.225 /var/log/[your_mail_log]|grep reject -- Stan
