Localhost 127.0.0.1 may be forged ??

Mzee · 03-07-2003, 06:19 PM

Hi,

I am running RedHat 8.0 and have a problem with SendMail.
I am using DSL and a dynamic service for DNS. I can send and receive mail okay using mail/pine from the server console.

The problem is that when I send mail to others, it has the following in the headers

Received: from server.mydomain.net (localhost [127.0.0.1] (may be forged))

This is causing the messages to be rejected by a lot of mail servers. Is there any way I can stop Sendmail from doing this ?

Thanks

Mara · 03-08-2003, 11:19 AM

You have not configured your Sendmail. Open sendmail.cf file in any editor and change your IP, server name and so on.

Mzee · 03-12-2003, 10:20 AM

Actully I have configured send mail using the sendmail.mc file and ran the M4 command.

I can send messages when logged onto the server with ssh using pine or the mail command. I can also read my messages.

Just cannot send from a pop client.

Mara · 03-13-2003, 12:52 PM

Try to connect using telnet:
telnet yourmachine pop3
+OK (message with 'ready' or 'ok')
USER yourlogin
+Ok User name accepted (or similar)
PASS yourpassword
And you should be logged in. In your case, there should be an error. Note it down.
BTW You don't send via POP3. You send using SMTP.

Mzee · 03-13-2003, 11:14 PM

Thanks for the reply.

I tried that and here is what I got from:

telnet mymachine pop3

+OK pop3 machinename.domainname.com v2001.78.rh server ready
USER myusername
+OK Username accepted, password please
mypassword
-ERR Unknown AUTHORIZATION state command

Z28kid · 03-14-2003, 12:03 AM

Mzee, i have the same setup as you except i have a cable modem.

How did you set up your sendmail?

what changes did you make in the sendmail.cf or sendmail.mc

Are you able to reciever mail from the outside world?

I would really appericate the help....

Also this way are you able to set up a email like

Webmaster@mydomain.com

Mara · 03-14-2003, 03:23 PM

Quote:

Originally posted by Mzee

+OK Username accepted, password please
mypassword
-ERR Unknown AUTHORIZATION state command

Should be:
+OK Username accepted, password please
PASS mypassword

Mzee · 03-14-2003, 06:55 PM

ohh ohh

did that and I got

+OK Mailbox open, 0 messages

And just for kicks I tried the following in my sendmail.mc
FEATURE(`relay_local_from') and all messages flow from workstations like crazy ...... and from spammers as well.

I have taken it back to FEATURE(`relay_hosts_only') and put all my hosts in the access.db with RELAY (tried OK as well) and the problem still persists.......

help

Mzee · 03-14-2003, 07:07 PM

Quote:

Originally posted by Z28kid
Mzee, i have the same setup as you except i have a cable modem.

How did you set up your sendmail?

what changes did you make in the sendmail.cf or sendmail.mc

Are you able to reciever mail from the outside world?

I would really appericate the help....

Also this way are you able to set up a email like

Webmaster@mydomain.com

I am able to receive mail from the outside world.
The only changes that I have made that seem to work are

dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl : To enable sendmail to listen on my network interface

LOCAL_DOMAIN(`mydomain.net')dnl : To reflect my actual domain

MASQUERADE_AS(`mydomain.net')dnl : To masq emails to appear to be from mydomain.net

FEATURE(masquerade_entire_domain)dnl : enabled this ... cant remember why ....

Hope that make sense ....

stickman · 03-14-2003, 07:37 PM

Typically the "may be forged" message appears when the forward and reverse DNS entries do not match. Does server.mydomain.net point to 127.0.0.1 or the public IP of the system? Some distro like to put the server name in /etc/hosts on the same line with localhost.

Mara · 03-15-2003, 03:11 PM

Quote:

Originally posted by Mzee

dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl : To enable sendmail to listen on my network interface

I think there's the problem. Any non-local IP would be much better.

Mzee · 03-16-2003, 12:48 AM

Do I need to have something else for that feature !!!!!

I thought that removing the feature completely defaults sendmail to listen to my network interface ???

Mara · 03-16-2003, 10:45 AM

Try to remove it. Sendmail should search for interface and use it. NOTE: Comment it out, don't remove. Just in case.

Mzee · 03-18-2003, 08:30 PM

The line has always been commented out .....

results still unchanged

Mara · 03-20-2003, 01:51 PM

Could you post your sendmail.cf? But first try this:
yourdomain.net define(`confDOMAIN_NAME', `$w.$m')dnl