Basic Sendmail Configuration question?

Dennis,

First you need to make sure that the MX (Mail Exchanger) entry is pointing to your new RH machine.

Next, edit the file /etc/mail/sendmail.cw, and add the your domain, or/and any other domain that you would be receiving mail for.

If this server will be acting as outgoing SMTP server, you might want to take a look at masquerading feature.  The quickest way would be adding the "DMyourdomain.com", in /etc/mail/sendmail.cf.

Alternately you can add the line in /etc/mail/sendmail.mc

DOMAIN(yourdomain.com)dnl

Next is to enable sendmail to accept incoming connection

From jlevie's comment:

https://www.experts-exchange.com/questions/20150630/Beginners-Question.html
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Uncomment the following line in the  /etc/sendmail.mc

DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')

and build & install a new sendmail.cf with:

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

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Some PAQ that you might want to look at;
https://www.experts-exchange.com/questions/20150630/Beginners-Question.html
https://www.experts-exchange.com/questions/20137325/Cannot-connect-to-port-25.html


Next is to enable pop3 clients to connect to your machine;

Excellent tutorial here;
http://www.yolinux.com/TUTORIALS/LinuxTutorialMailRetrieval.html

briefly:
# chkconfig ipop3 on

Make sure you have pop3 package installed.  I think it is bundled together with imap pkg.

I hope the information is helpful.

don't forget to list the ip addresses that are allowed to relay in /etc/mail/access and restart sendmail

Otherwise Samri seems to have the perfect answer....

Samri,

I followed your instruction to change couple things in the /etc/mail/sendmail.mc
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')

In addition, I enable those too.
TRUST_AUTH_MECH(`DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
FEATURE(delay_checks)dnl
Cwlinuxserver.mydomain.com
DMmydomain.com

I also add this in /etc/mail/access
200.10.10.0 RELAY
and those two lines in /etc/mail/local-host-names
MyDomainName.com
MyDomainName

I was able to telnet localhost 110
+OK POP3 linuxserver server ready
I was able to mail dennis@mydomain.com
But, I was not able to reply to root@localhost.localdomain

Again, I do not need to configure any SMTP and DNS.  Our ISP should take care of those.  What steps I should do?  Thanks for your input! –Dennis

Dennis,

could you send mail to root@mydomain.com, or even root@host.mydomain.com.

When you said you were unable to send mail to root@localhost.localdomain, did you do this from the server itself, or from your workstation using a mail client (eudora for example).

One possibilities would be Masquerading is not working for user root,  check th CE option in sendmail.cf, and try to comment it, and restart sendamil ("service sendmail restart", or "/etc/init.d/sendmail stop" and "/etc/init.d/sendmail start");

You might want to check out Sendmail websites on this issue (rather than I cut-and-paste).

http://www.sendmail.org/m4/masquerading.html

You should be able to use the options in sendmail.mc, and rebuild the sendmail.cf.

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

I hope this works

Some of the FEATURE that can be included in sendmail.mc

http://www.sendmail.org/m4/features.html

be looking in your /var/log/maillog and let us know what it says

should'nt it be
200.10.10. RELAY

What do you have in your /etc/hosts file?

Hi,

Sorry for the confusion, we still have our MMDF mail server running. So, if I send to root@mydomain.com.  That goes to our MMDF root account, but not Sendmail root account.  My question is how do I reply to Linux machine.  I know the POP3 is ready.  What other steps I should do in order for Sendmail retrieve incoming email.
I was able to send email by do this
On the linux box, logon as user dennis
# mail dennis@yahoo.com
I got it in my yahoo mailbox.  It was coming from dennis@localhost.localdomain (Linux Sendmail).  Is there a file I can change that to dennis@linuxserver.mydomain.com?
In addition, what other configurations I need to do on these /etc/mail/access and /etc/mail/local-host-names files?
Thanks again for all your inputs! -Dennis

Please delete this question.  Thanks!

Please close this question and refund the points!  Thx!