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Mail Relay Issue

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May 7, 2008
4
CA
We have an issue in sending confirmation emails to our customers. Your help is greatly appreciated.

Once our customer fills the form on our website (XXXXXXXX.com), the customer has to receive a confirmation email. Once the customer fills and submits the form
The DMZ server (Windows) will alert the mail relay server (UNIX server) asking to send out the confirmation email. Recently the IP address of DMZ (Windows) server was changed from 10.XXX.XXX.X to 10.XXX.XXX.X. We have received the following errors to Big Brother.

/var/log/syslog (scanned at Wed May 7 09:57:09 EDT 2008)
May 7 09:54:46 merry sendmail[5628]: [ID 801593 mail.notice] m47DskK05628: ruleset=check_rcpt, arg1=, relay=[10.223.242.2], reject=550 5.7.1 ... Relaying denied. IP name lookup failed [10.223.242.2]
May 7 09:55:05 merry sendmail[6806]: [ID 801593 mail.notice] m47Dt4K06806: ruleset=check_rcpt, arg1=, relay=[10.223.242.2], reject=550 5.7.1 ... Relaying denied. IP name lookup failed [10.223.242.2]

/var/log/syslog (scanned at Wed May 7 09:27:08 EDT 2008)
May 7 09:26:08 merry sendmail[6144]: [ID 801593 mail.notice] m47DQ8K06144: ruleset=check_rcpt, arg1=, relay=dhcp-10-127.int.carswell.com [10.192.10.127], reject=550 5.7.1 ... Relaying denied

From the above alert the communication between DMS server and merry server looks fine. The problem is with merry server and due to some issues the merry server is unable to communicate with external world. The DMZ server (10.223.242.2) successfully
communicates with merry (UNIX) server asking to relay the confirmation email. Now the issue might be with the configuration of the DMZ server’s IP address
on merry (UNIX) server. My colleageue says to a whole bunch of files on merry server under /usr/local/etc/nsdata. I think it is do with sendmail files like sendmail.cf. Pl advice me. I will summarizere.

Thanks in advance


Rob

 
You need to add the reverse entry in your DNS. First, locate your named.conf, sometimes a link in /etc/named.conf. First, figure out how your OLD ip was configured but to add the new entry it might be a reference to:
10.in-addr.arpa
or
223.10.in-addr.arpa
or
242.223.10.in-addr.arpa
 
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