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Top Forums UNIX for Dummies Questions & Answers Problem with mail.
# 1  
Old 07-24-2002
Problem with mail.

Hello!

I have two servers with Solaris 2.7
I send mail from first to second.
The first is also dns. It's known as "ns.oldb.pkb", second is "dev.pkb".
Ping works successful from 1 to 2 and vice verse.

But when I am trying on first server :
sendmail -v user@dev.pkb < /etc/motd
it is writing:
user@dev.pkb... Deferred: Name server: mailhost.oldb.pkb: host name lookup failure
I tried to set MX in pkb zone in dns for dev.pkb. , but nothing changed.
I no anywhere set "mailhost.".
All my mails queued in /var/spool/mqueue

What I do incorrectly?
I think it's something wrong with dns, but I don't known what is.

PS.
# /usr/lib/sendmail -d0.1 -bt < /dev/null
Version 8.11.6+Sun
Compiled with: MAP_REGEX LOG MATCHGECOS MIME7TO8 MIME8TO7 NAMED_BIND
NDBM NETINET NETUNIX NEWDB NIS NISPLUS QUEUE SCANF SMTP USERDB
XDEBUG

Thank you.
# 2  
Old 07-24-2002
Great job of giving all 'needed' information.

It sounds like there is a problem with the sendmail set up - it probably has 'mailhost' set in the /etc/mail/sendmail.cf (this is the default set up within sendmail sent with Solaris). Two choices if that is true. Either set up mailhost in DNS to point to your host or change sendmail.cf to point to your host. Either will fix your problem. (Fixing it in DNS will insure other servers will also work - fixing it in sendmail.cf means fixing it on all servers.)
# 3  
Old 07-25-2002
Hello!

What do you mean under "mailhost in DNS to point to your host"? Does it mean that:
If I have DNS server ns.oldb.pkb and send mail from it to another, than I need to set mailhost.oldb.pkb as ns.oldb.pkb. Is it?

If I do so , /var/adm/messages give me next:
.... sendmail[...]: ..... :SYSERR(user): mailhost.oldb.pkb. config error: mail loops back to me (MX problem).

I thinked that sendmail sends mail to "mailhost" only if it can't deliver it to recipient's host directly. Am I wrong?

P.S> You right sendmail.cf. Mailhost present in it.

Thank you.
# 4  
Old 07-25-2002
Since sendmail.cf has mailhost in it, it's looking for a server called mailhost OR a DNS cname for mailhost.

This is what you need to do:

If you want to fix it in the sendmail.cf file, change mailhost to be the name of the mail server (what ever that is). Post back what it had in there just to make sure it's what you are looking for -

If you want to fix it in DNS, then you have to do a couple of things:
Post back what is in sendmail.cf for mailhost (the whole line).
Set up a MX record and set up mailhost to an IP of a system.

To see this, do a nslookup
% nslookup
Default Server: which1.mycom.com
Address: 10.140.16.20

> set type=mx
> ibm.com


ibm.com preference = 0, mail exchanger = ns.watson.ibm.com
ibm.com nameserver = ns.watson.ibm.com
ibm.com nameserver = ns.austin.ibm.com
ibm.com nameserver = ns.almaden.ibm.com
ibm.com nameserver = internet-server.zurich.ibm.com
ns.watson.ibm.com internet address = 198.81.209.2
ns.austin.ibm.com internet address = 192.35.232.34
ns.almaden.ibm.com internet address = 198.4.83.35
internet-server.zurich.ibm.com internet address = 195.176.20.204

The mail exchange for ibm.com is ns.watson.ibm.com. It's address is 198.81.209.2.

Check out Mr. DNS FAQ for mail questions. Great info in there and the one of the folks that wrote "DNS & Bind" answers most of the questions.
 

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