how does mailx look up the mail server

[Phillip Thayer]

Check the contects of the /etc/nsswitch.conf and make sure they are really correct. Also, shouldn't you have a specific mail server name in the
export SENDMAIL_SERVER_NAME= line? Something like:

export SENDMAIL_SERVER_NAME=mailhost1.domain2.com

Phil

[ran_li]

/etc/nsswitch.conf
passwd: files ldap
group: files ldap
hosts: files ldap dns
networks: files ldap
protocols: files ldap
rpc: files ldap
publickey: files
netgroup: files ldap
automount: ldap files
aliases: files
services: files ldap

I don't have any value for SENDMAIL_SERVER_NAME in /etc/rc.config.d/mailservs, do I have to?

mailx does not require sendmail daemon to be runing right.

Thanks!

[Kasper Haitsma]

Hi,

to emulate, how sendmail is looking up the mail destination, and works out how mail will get there, type:

nslookup -q=mx
e.g.
nslookup -q=mx hp.com

this results in a list with weighed mail relays (MX records). the lowest number will be attempted first.
you can also verify if the mail relay you intnd to use has the most important MX-record for itself, from the system you are sending from (this can vary)

nslookup -q=mx mailhost1.domain2.com

if this seems in order, you can test your sendmail.cf configuration file, by starting it in testmode:

sendmail -bt
> /parse user@dest.domain.

this will give you the real mailertype, relay and "destination user" sendmail will be using
i.e.
mailer smtp, host relay.domain.com, user user@dest.domain

you need to quit test mode using
with regards to the nsswitch.conf, do you need ldap and dns for host lookup, for the applications running on the system? if not, you could just have files in this line and add mailhost1 to /etc/hosts (if sendmail can only find mailhost1, it can only use that one)

if the result of the test is not what you want, and you need to use ldap and dns for hosts lookup, you could build a new sendmail.cf:

cd /usr/newconfig/etc/mail/cf/cf
./gen_cf

and answer the questions you find appropriate

HTH

kasper
hp

[ran_li]

Thanks for the details!

nslookup -q=mx mailhost1.domain2.com
Using /etc/hosts on: hp03

looking up FILES
Trying DNS
mailhost1.domain2.com preference = 5, mail exchanger = mailhost1.domain2.com
mailhost1.domain2.com internet address = 14x.13x.1x.1x

One of the test result that I don't understand is if I did not specify the DS entry in sendmail.cf, and this host(hp03) is NOT in the allow relay list on mailhost1.domain2.com, mail still can be send out to my corporate email account as well as Internet email account(yahoo), but the mail headers are different.

1. for the mail arrived at my corporate mailbox, the header says it uses mailhost1.domain2.com for the mail routing.

2. for the mail arrived at my internet(yahoo) mailbox, the header says it uses 2x7.1x7.5x.1x,

3. I could not lookup this IP address(2x7.1x7.5x.1x) anywhere on the internal LAN, however it can be resolved outside on the internet(outside the corporate network).

It must be a legacy mail server somewhere (because of the company's acquisition), but I m wondering what is the mail route and how the DNS and mail server configuration will affect it.

We use ldap for user authentication, automount and netgroup, it has hosts entries but we use DNS to lookup the hosts.

Regards!

[gopal.ak]

Hi !! ALL !
I am naive member to this forum.
The topic initiated, here would have been initaied by me today as i have to send message using mailx. SO i would like.. to have summarized , rather documented version of this usage, which will help me. So plz.. reply.. I am sure Mr ran_li will reply.. looking forward for ur replies .... & suggegstions..

[ran_li]

gopal.ak,

what is your question or problem encountered.

Ran

[ran_li]

gopal.ak,

Please initialize another thread for your questions, my problem is not apply to your case specifically.

Ran