PostFix EHLO Doesn't Recognize My IP When Tailing mail.log

mosharaf_linux · 08-11-2011, 02:20 AM

disconnect from unknown[172.17.196.120]
Aug 11 13:16:03 debian postfix/smtpd[30572]: connect from unknown[172.17.196.120]
Aug 11 13:16:03 debian postfix/smtpd[30572]: lost connection after EHLO from unknown[172.17.196.120]
Aug 11 13:16:03 debian postfix/smtpd[30572]: disconnect from unknown[172.17.196.120]
Aug 11 13:16:03 debian postfix/smtpd[29185]: connect from unknown[172.17.196.120]
Aug 11 13:16:04 debian postfix/smtpd[29185]: lost connection after EHLO from unknown[172.17.196.120]
Aug 11 13:16:04 debian postfix/smtpd[29185]: disconnect from unknown[172.17.196.120]

I have tried and tired to fix this issue but can never seem to hit the mark and find how to resolve this issue once and for all.

the IP you are seeing in the log above is my Intranet NAT IP which controls access to the Internet.

Can you tell me what I am missing so I can resolve this issue?

Thank you very much

Best Regards

timur91 · 08-11-2011, 02:59 AM

To fix this you need to add a reverse DNS record for the 172.17.196.120 IP:

Code:

[root@secure3 ~]# nslookup 172.17.196.120
Server:         8.8.4.4
Address:        8.8.4.4#53

** server can't find 120.196.17.172.in-addr.arpa.: NXDOMAIN

You will need to ask your ISP to set the reverse DNS record

java socket

king william · 08-12-2011, 12:53 AM

you can add the subnet of your Intranet to the configuration files of your postfix.