Hi,
I'm hosting my own mail server using postfix. I've got an Internet Domain Name
(cinema-voiron.fr) and a fix IP address. The router which manages my internet
connection redirects incoming smtp request to my server using NAT (port 25
opened on my server and on my public IP)
I successfully receive mails from most of people excepts for those with a mail
address which looks like x...@orange.fr. Looking in the postfix log file, I did
not find any mail sent from these addresses. Using tcpdump on my server, I
discovered that it seems that the TCP connection between my mail server
(passrlminisrv) and the remote smtp server fails.
22:16:25.978773 IP smtp10.smtpout.orange.fr.41183 >
passrlminisrv.cinema-voiron.fr.smtp: Flags [S], seq 105066692, win 5840,
options [mss 1380,sackOK,TS val 2993558281 ecr 0,nop,wscale 8], length 0
22:16:28.978262 IP smtp10.smtpout.orange.fr.41183 >
passrlminisrv.cinema-voiron.fr.smtp: Flags [S], seq 105066692, win 5840,
options [mss 1380,sackOK,TS val 2993561281 ecr 0,nop,wscale 8], length 0
22:16:34.977258 IP smtp10.smtpout.orange.fr.41183 >
passrlminisrv.cinema-voiron.fr.smtp: Flags [S], seq 105066692, win 5840,
options [mss 1380,sackOK,TS val 2993567281 ecr 0,nop,wscale 8], length 0
22:16:41.011109 IP passrlminisrv.cinema-voiron.fr.smtp >
smtp10.smtpout.orange.fr.41183: Flags [S.], seq 1934215990, ack 105066693, win
65535, options [mss 1460,nop,wscale 1,nop,nop,TS val 537443811
ecr2993567281,sackOK,eol], length 0
22:16:41.051125 IP smtp10.smtpout.orange.fr.41183 >
passrlminisrv.cinema-voiron.fr.smtp: Flags [R], seq 105066693, win 0, length 0
Any idea of the root cause? Could it be an issue with my DNS configuration or
is it related with my own smtp server?
Thank you in advance for your help
Xavier
