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Relaying Denied. IP name lookup failed

Hi everyone,
I have checked the sendmail faq for the answer and gone through almost
all the configuration options. But still the following error persist.
We have one departmental mail server mail.cse.mnit.ac.in which send
and receive mails to/from mail.mnit.ac.in which forwards to different
departments and outside world. We are able to send the mails from
mail.cse.mnit.ac.in within the domains controlled by mnit.ac.in but
still failing to send the mail outside (e.g. yahoo.co.in). I have
checked the access database at the relaying server mail.mnit.ac.in but
still the mail sent from user@cse.mnit.ac.in is sent back with failure
delivery the transcript is as follows :
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The original message was received at Sat, 14 Feb 2004 14:17:00 +0530
from cse.mnit.ac.in [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<gaur_ms@yahoo.co.in>
    (reason: 550 5.7.1 <gaur_ms@yahoo.co.in>... Relaying denied. IP
name lookup failed [172.30.3.2])

   ----- Transcript of session follows -----
.... while talking to mail.mnit.ac.in.:
>>> DATA
<<< 550 5.7.1 <gaur_ms@yahoo.co.in>... Relaying denied. IP name lookup
failed [172.30.3.2]
550 5.1.1 <gaur_ms@yahoo.co.in>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)

    [ Part 2: "Delivery Status" ]

Reporting-MTA: dns; cse.mnit.ac.in
Received-From-MTA: DNS; cse.mnit.ac.in
Arrival-Date: Sat, 14 Feb 2004 14:17:00 +0530

Final-Recipient: RFC822; gaur_ms@yahoo.co.in
Action: failed
Status: 5.7.1
Remote-MTA: DNS; mail.mnit.ac.in
Diagnostic-Code: SMTP; 550 5.7.1 <gaur_ms@yahoo.co.in>... Relaying
denied. IP name lookup failed [172.30.3.2]
Last-Attempt-Date: Sat, 14 Feb 2004 14:17:01 +0530


    [ Part 3: "Included Message" ]

Date: Sat, 14 Feb 2004 14:17:00 +0530 (IST)
From: root <root@cse.mnit.ac.in>
To: gaur_ms@yahoo.co.in
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We are using sendmail-8.12.10-1.
Any help is most welcome.
TIA 
Gaur
0
gaurms (8)
2/14/2004 9:07:45 AM
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karmath wrote:

> [...] We are able to send the mails from
> mail.cse.mnit.ac.in within the domains controlled by mnit.ac.in but
> still failing to send the mail outside (e.g. yahoo.co.in). I have
> checked the access database at the relaying server mail.mnit.ac.in but
> still the mail sent from user@cse.mnit.ac.in is sent back with failure
> delivery the transcript is as follows :

You probably currently have a line like this in your access table:
mnit.ac.in           RELAY

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> The original message was received at Sat, 14 Feb 2004 14:17:00 +0530
> from cse.mnit.ac.in [127.0.0.1]
> 
>    ----- The following addresses had permanent fatal errors -----
> <gaur_ms@yahoo.co.in>
>     (reason: 550 5.7.1 <gaur_ms@yahoo.co.in>... Relaying denied. IP
> name lookup failed [172.30.3.2])

As this message tells you, the IP 172.30.3.2 cannot be resolved to a 
hostname, and because of the access table entry above sendmail does not 
know that this IP has anything to do with the mnit.ac.in domain.

Add reverse entries to the DNS or/and add a line like this in your 
access table:

Connect:172.30         RELAY

Make sure your routers are spoofing protected.


-- 
Marco Senft
TTG - Technische Treuhand GmbH        http://www.t2g.ch/

0
m.senft (93)
2/14/2004 11:15:52 AM
> karmath wrote:
> 
> > [...] We are able to send the mails from
> > mail.cse.mnit.ac.in within the domains controlled by mnit.ac.in but
> > still failing to send the mail outside (e.g. yahoo.co.in). I have
> > checked the access database at the relaying server mail.mnit.ac.in but
> > still the mail sent from user@cse.mnit.ac.in is sent back with failure
> > delivery the transcript is as follows :
> 
> You probably currently have a line like this in your access table:
> mnit.ac.in           RELAY
> 
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > The original message was received at Sat, 14 Feb 2004 14:17:00 +0530
> > from cse.mnit.ac.in [127.0.0.1]
> > 
> >    ----- The following addresses had permanent fatal errors -----
> > <gaur_ms@yahoo.co.in>
> >     (reason: 550 5.7.1 <gaur_ms@yahoo.co.in>... Relaying denied. IP
> > name lookup failed [172.30.3.2])
> 
> As this message tells you, the IP 172.30.3.2 cannot be resolved to a 
> hostname, and because of the access table entry above sendmail does not 
> know that this IP has anything to do with the mnit.ac.in domain.
> 
> Add reverse entries to the DNS or/and add a line like this in your 
> access table:
> 
> Connect:172.30         RELAY
> 
> Make sure your routers are spoofing protected.
Many thanks
It worked. Now I can send the mails outside and also within my
intranet subdomain. Now only problem remains is that, from outside
when a user send a mail (from user@yahoo.com) then it gets delivered
to main mailserver (mail.mnit.ac.in) and user@yahoo.com does not
receive any bounced back message but when MTA of mail.mnit.ac.in tries
to talk to mail.cse.mnit.ac.in, the MTA of mail.cse.mnit.ac.in seems
to refuse the connection ! What can possibly be problem here ?
Relay is working fine as I can send a mail from user@cse.mnit.ac.in
to/from user@mnit.ac.in.
Many thanks in advance
Gaur
0
gaurms (8)
2/16/2004 7:12:52 AM
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I've spent a couple of days on this and I'm to the "bang-my-head 'gainst the monitor and babble in tongues" mode. First - SuSE Pro 9.3, Linux 2.6.11.4-21.7, Apache 2.0.53, PHP 4.3.10 I have sendmail running on the local server - mail from unix (1) mail and mutt work locally on the server. This is, specifically, sending mail to a localhost user or another user off on the net somewhere works fine. When I try either simple, or complex, mail() functionality via PHP, it silently fails. And, by silently, I mean that there are no error messages in the PHP log (logging of all messages is enabled), sendmail log, or /var/log/messages or /var/log/warnings. The mail() returns a FALSE indicating that the php->sendmail handoff never occurs. I've even tried forcing the return address but that's not working either. Stable applications, like OSCommerce for example, also fail under this configuration. /etc/php.ini is correctly configured and the sendmail_path is defined correctly. As a matter of fact, the results are the same whether or not sendmail_path is implicitly or explicitly configured. Currently: ; For Unix only. You may supply arguments as well (default: "sendmail -t -i"). sendmail_path = '/usr/sbin/sendmail -t -i' .... safe_mode = Off I've tried mutltiple sendmail configurations but this was a waste of time for the reason that sendmail is never seeing the email handoff from php. This was working under my 9.2 instal...

Sendmail host name lookup failure
I keep gettign the following message when trying to send mails with sendmail: Running /var/spool/mqueue/j8T9NkGt001738 (sequence 3 of 18) <***@***.org>... Deferred: Name server: ***.org.: host name lookup failure This happens with every message sent. I have tried a MASQUERADE_AS with no success (after some vaguely similar problem found on some newsgroup over the last few days of trying), and have looked through sendmail options. resolv.conf is configures correctly (as far as I can tell) and dig works fine. I would be happy to use a SMART_HOST, but my mail server requires authentication. If anyone can solve this problem, or explain how to use a SMART_HOST with authentication I would be very grateful. Thank-you Martin Stone Just to add, incoming e-mails work fine. ...

urgent: thx IP lookup failed
hello what i can do against this (see topic) smtp auth is on, so i want that he checks first user/pw instead of checking the ip of the access point. this problem is only on some ips in europe (on access points) when some employer connects to our mailserver and wanna send mails. thanks richard wrote: > what i can do against this (see topic) What's the problem? If some DNS lookups fails, then you need to check DNS (server and resolver). > smtp auth is on, so i want that he checks first user/pw instead of checking > the ip of the access point. > this problem is only on some ips in europe (on access points) when some > employer connects to our mailserver and wanna send mails. Again: what's the problem? Please give a real example of what happens and what you want to happen. PS: if a client authenticates using a "trusted" mechanism, relaying is allowed (IP lookup problem do not matter in that case). See cf/README. -- Note: please read the netiquette before posting. I will almost never reply to top-postings which include a full copy of the previous article(s) at the end because it's annoying, shows that the poster is too lazy to trim his article, and it's wasting the time of all readers. Hello Clau� Thx a.) The Problem is "IP name Lookup failed [IP here]" From a User who trys to send a email over our emailserver to a extern email adr. He Auth. over User/PW The user has a UMTS Uplink with a ip which is not resolva...

IP address lookup based on device name
I am trying to find out an IP address of certain devices. For example I have a computer that communicates with the AS400 through client access and a telnet session. On the As400 it shows up as a devices named PCUSERS1 and PCUSERS2. I want to be able to find out the IP address of that computer based on the information that I know, the AS400 device name. Is there an easy way to do this with some already built in commands, or are we going to have to write a program or telnet exit program? <gregbrune@hotmail.com> wrote in message news:1113578794.276178.117840@l41g2000cwc.googlegroups.com... >I am trying to find out an IP address of certain devices. For example > I have a computer that communicates with the AS400 through client > access and a telnet session. On the As400 it shows up as a devices > named PCUSERS1 and PCUSERS2. I want to be able to find out the IP > address of that computer based on the information that I know, the > AS400 device name. Is there an easy way to do this with some already > built in commands, or are we going to have to write a program or telnet > exit program? > This article should be what you are looking for. http://www.iseriesnetwork.com/artarchive/index.cfm?fuseaction=viewarticle&CO_ContentID=17246&channel=art&subart=top&topicid=10 James R. Perkins Hi - On 15 Apr 2005 08:26:34 -0700, gregbrune@hotmail.com wrote: >I am trying to find out an IP address of certain devices. For exampl...

Relaying all mail to a particular relay
Hi, I have two servers A and B. A is connected to the internet and can send mail out. B is on an internal private network and doesnt have access to the internet at all (even DNS). I want email sent from B to be relayed through A. On A I have changed the access file to <ip of B> RELAY done a make and restarted sendmail. On B I tried changing the DS line in sendmail.cf like this: DS [IP of A] but that didnt achieve what I wanted, everything just sits in the spool mail queue on A. Can someone give me a hand on what I need to do to tell B to send all mail via A? Thanks -Rob In article <c7a0a860.0401210746.663b3879@posting.google.com> rob@robhulme.com (Rob Hulme) writes: > >I have two servers A and B. > >A is connected to the internet and can send mail out. >B is on an internal private network and doesnt have access to the >internet at all (even DNS). > >I want email sent from B to be relayed through A. > >On A I have changed the access file to <ip of B> RELAY done a make and >restarted sendmail. > >On B I tried changing the DS line in sendmail.cf like this: > >DS [IP of A] Don't edit sendmail.cf directly, use a .mc file (see SMART_HOST in cf/README). >but that didnt achieve what I wanted, everything just sits in the >spool mail queue on A. > >Can someone give me a hand on what I need to do to tell B to send all >mail via A? First of all use 'mailq' to check *why* the messages ar...

mail()Relaying denied. Proper authentication required
when sending an email from the mail() function I get this message: mail(): SMTP server response: 550 5.7.1 <test@test.com>... Relaying denied. Proper authentication required I did set the php.ini values like this: SMTP = mail.myserver.com ; for Win32 only smtp_port = 25 sendmail_from= webmaster@myserver.com; for Win32 only I am coding on a "localhost" machine and I believed that connecting to a mail server like it's done above would work. what's wrong ? How to set authentication for letting my server accept my mail ? Bob Bob Bedford wrote: > > when sending an email from the mail() function I get this message: > mail(): SMTP server response: 550 5.7.1 <test@test.com>... Relaying denied. > Proper authentication required > > I did set the php.ini values like this: > SMTP = mail.myserver.com ; for Win32 only > smtp_port = 25 > sendmail_from= webmaster@myserver.com; for Win32 only > > I am coding on a "localhost" machine and I believed that connecting to a > mail server like it's done above would work. what's wrong ? Most likely, your SMTP server requires authorization. Turn it off or, better yet, forget the mail() function and incorporate phpMailer into your application. This way, your application could be deployed anywhere and work without eithrt local or remote SMTP server. phpMailer can be found here: http://phpmailer.sf.net/ Cheers, NC ...

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