Unable to send mail. Relaying Denied IP lookup failed.

mkkrish · 08-07-2013, 07:29 AM

My web server running on redhat. Drupal installed on it.

We have been sending mail from drupal with smtp.

Now the relay server changed to new IP. Relay server IP updated in drupal authentication.
I updated new IP in php program and /etc/hosts file.

I am able to connect relay server from webserver using
Telnet protocol.

I made smtp debug ON in the php program to trace error.
The error while sending mail shows,

RELAYING DENIED(XXX.XXX.XX.XX] IP lookup failed.
I checked /etc/mail/access. The entry 127.1.0.0 is existing there.

There were no other change except the relay server IP.

While sending mail it throws error

"Relaying Denied [XXX.XXX.XX.XX] IP Lookup failed.

Please suggest,Any solution to recover from this error.

Ser Olmy · 08-07-2013, 10:09 AM

The relay server/smart host simply doesn't accept mail from your server.

I assume the X'ed out IP address is your public IP? If you're really supposed to be able to relay through the host in question, you need to speak to the administrator of that system.

Perhaps you need to authenticate before sending mail, or your IP needs to be added to a list, or a reverse DNS record may have to be created, or there's a problem with the SPF records for the sending domain... only the server admin can tell you what the problem is.

mkkrish · 08-08-2013, 03:24 AM

The XXX.XXX.XXX.XX is our Public IP. But I am able to telnet to the relay server successfully from webserver. This indicate there is no problem
in connecting relay server.
I have updated /etc/host file. In php program I updated new relay server. In drupal I have authenticated SMTP with new relay IP.

After doing all these things , it surprising, to see that relaying is denied.

What possible test(s) with commands can I try from the web server to send mail. Any idea please.

Ser Olmy · 08-08-2013, 03:54 AM

Quote:

Originally Posted by mkkrish

The XXX.XXX.XXX.XX is our Public IP. But I am able to telnet to the relay server successfully from webserver. This indicate there is no problem
in connecting relay server.

It indicates that you're able to connect to the server, but says nothing about whether that server is willing to forward mails on your behalf or not.

Quote:

Originally Posted by mkkrish

I have updated /etc/host file. In php program I updated new relay server. In drupal I have authenticated SMTP with new relay IP.

After doing all these things , it surprising, to see that relaying is denied.

What possible test(s) with commands can I try from the web server to send mail. Any idea please

The error message is quite self-explanatory. The mail server is rejecting your mails, as it isn't configured to forward mails from your IP address.

Simple test:

Code:

~$ telnet ip.address.of.mailserver 25
220 mailserver.name and some other text
HELO servername
250 mailserver.name Hello your.ip.address, pleased to meet you
MAIL FROM: <your sender address>
250 Sender <your sender address> OK
RCPT TO: <a recipient address>[

The next response from the server will tell you all you need to know.

You type the commands in bold, the rest are responses from the server. The identity behind the HELO command is irrelevant, but has to be present. The mail addresses must be inside angled brackets ("<" and ">").