Mail Exchange Problem

[Mark_Andrews at isc.org]

> Recently I setup DNS server on my domain by using LINUX.
> This machine also has FTP, MAIL service.
> This machine's host name is 'DNS'.
> The following is my Zone.db file
> ----------------------------------------------------------------------------
> --------------
> @    IN SOA dns.my-domain-name.com. hostmaster.my-domain-name.com.  (
>                                       199910161  ; Serial
>                                       28800      ; Refresh
>                                       7200       ; Retry
>                                       604800     ; Expire
>                                       86400 )    ; Minimum
> 
> @    NS     dns.my-domain-name.com.
> @    NS     dns2.my-domain-name.com.
> 
	Make this

	@ MX 10 dns.my-domain-name.com.

	as MX records (or any other type of record) should not reference
	a CNAME.

> @    MX 10  mail.my-domain-name.com.
> 
> localhost               A       127.0.0.1
> dns                    A       dns-ip-address
> dns2                  A       dns2-ip-address
> www                     A       web-server-ip-address
> 
> mail            CNAME   dns
> ftp             CNAME   dns
> ----------------------------------------------------------------------------
> -----------
> My problem is that mail exchange.
> I can send and receive a mail with account at dns.my-domain-name.com
> 
> But when I send a mail, receiver receives account at dns.my-domain-name.com
> and when somebody send mail without hostname (like
> account at my-domain-name.com),
> he receives returned mail as follows :
> ----------------------------------------------------------------------------
> -------------
>    ----- The following addresses had permanent fatal errors -----
> <account at my-domain-name.com>
> 
>    ----- Transcript of session follows -----
> ... while talking to mail.domain-name.com.:
> >>> RCPT To:<account at my-domain-name.com>
> <<< 551 <account at my-domain-name.com>... we do not relay
> 550 <account at my-domain-name.com>... User unknown
> ----------------------------------------------------------------------------
> --------------
> 
> What is my problem?

	You havn't told sendmail that account at my-domain-name.com is
	local.  Add "Cwmy-domain-name.com" to sendmail.cf.

> How can I send e-mail without hostname?
> 
> Thanks in advance
> 
> 
> 
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org