Problem with mail.

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


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.

# /usr/lib/sendmail -d0.1 -bt < /dev/null
Version 8.11.6+Sun

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/ (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 to point to your host. Either will fix your problem. (Fixing it in DNS will insure other servers will also work - fixing it in means fixing it on all servers.)
# 3  
Old 07-25-2002

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 Mailhost present in it.

Thank you.
# 4  
Old 07-25-2002
Since 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 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 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:

> set type=mx
> preference = 0, mail exchanger = nameserver = nameserver = nameserver = nameserver = internet address = internet address = internet address = internet address =

The mail exchange for is It's address is

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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