external mails are not working

hello friends,
I am facing problem while sending mails from my outlook express through linux server ( Sendmail is configured linux server), but it goes from server directly
the error reported is :
----
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'snathan141@yahoo.com'. Subject 'testing mails', Account: '203.197.91.66', Server: 'semco.semco.co.in', Protocol: SMTP, Server Response: '551 <snathan141@yahoo.com>... we do not relay', Port: 25, Secure(SSL): No, Server Error: 551, Error Number: 0x800CCC79

(note : the same problem is faced by all users)

any help would be appriciated
Thanks
nathan141Asked:
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tdaoudConnect With a Mentor Commented:

You need to enbale your server to accept mail from your local machines to send it outside.  You do that by going to the directory /etc/mail, there you edit the file "access" and add the following line in it

192.118.88.   RELAY

if your domain starts with 192.118.88.XXX.  This tells senmail to accept mail from these stations to be relayed to outside.

Then after you modify the "access" file, you need to run the command "make" while you are in the directory /etc/mail.

Tarik
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nathan141Author Commented:
No its not working
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tdaoudCommented:

Just to confirm that you noticed the dot "." at the end of the first 3 parts of an IP address to indicate the IP beginning of.

Another thing is how are people putting their "From" adress in outlook settings?  Are they using user@your.domain or some other domain names?

You also have

127.0.0.1    RELAY

in your access file?

Tarik
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nathan141Author Commented:
ANOTHER THING i NOTICED IS THAT WHEN TRY TO PING THE LINUX SERVER FROM SAME MACHIEN ITS SAYING NETWORK UNREACHABLE, BUT ITS PINGING FROM ANOTHER MACHINE
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reason100Commented:
What version of Sendmail are you running?

To find out do the following:

1. At command prompt type:  telnet localhost 25
2. Write down the Sendmail Version.
3. Type "quit" to disconnect from port 25.

-Rod
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ifinchamConnect With a Mentor Commented:
Hi,

Most ISPs running SMTP servers do not 'relay' mail to prevent being used to distribute spam, etc. They require that the original point is their own smtp server and not another prior smtp server such as sendmail on a linux box.
See --> http://www.mail-abuse.org/dul/enduser.htm .

So your smtp server needs to be configured to co-exist with this situation. As explained in --> http://www.mail-abuse.org/dul/gateways.htm , you need to add some code to your sendmail config to masquerade as the ISP's smtp server :

define(`SMART_HOST',`mail.yourisp.net')dnl <--- Your ISP's mail server name goes here
MASQUERADE_AS(yourisp.net)dnl  <--- Your ISP's domain name goes here
FEATURE(`allmasquerade')dnl
FEATURE(`masquerade_envelope')dnl

You add these lines to your sendmail macro file, i.e. edit /etc/mail/sendmail.mc (location on redhat - others may be  /etc/sendmail.mc) and then compile the updated macro file into a new sendmail.cf :

m4 /etc/mail/sendmail.mc > /etc/sendmail.cf

(I'd suggest making a copy of the existing sendmail.cf first in case of problems)

Then restart sendmail with '/etc/rc.d/init.d/sendmail restart' and check for error messages with 'tail /var/log/messages'. If all looks OK it should now work.

Hope this helps, Iain
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nathan141:
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troopernCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
Split between tdaoud & ifincham.
Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

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