sendmail error

[Rodney Thayer]

I saw this too.  What I found was that sendmail has logic to declare to be
an error if sendmail on machine A receives mail from another host B where B
is known to be configured in DNS as an MX for A.

This is disabled with a COMPILILE TIME option.  I can't remember the exact
option as I'm not near that machine (it's off-network now similar to what
Albert does).  Check the source code for MX lookup.  I'll email the option
when I get back to the office.

>X-POP3-Rcpt: rodney at wizard
>From: Albert Cahalan <albert at ccs.neu.edu>
>Subject: sendmail error
>To: linux-sig at bcs.org
>Date: Thu, 7 Dec 1995 14:56:48 -0500 (EST)
>Sender: owner-linux-sig at bcs.org
>Reply-To: linux-sig at bcs.org
>
>I get error messages sent to the postmaster that contain this:
>
>   ----- Transcript of session follows -----
>554 MX list for zoomtel.com. points back to iota.zoomtel.com
>554 <tonyf at zoomtel.com>... Local configuration error
>
>Of course it points to iota.zoomtel.com, there is no zoomtel.com!
>What is going on here?  This is what I have:
>
>+-iota--------------------ISP------------------ The Net
>|
>+-epsilon
>|
>+-omega
>|
>+-gamma
>|
>+-alpha
>
>All my machines on the left are connected by ethernet, and iota is
>connected to the ISP via PPP every 20 minutes.  The ISP would call
>iota zoom.zoomtel.com, and the windows PCs on the Ethernet would
>call iota by number.
>
>nslookup gives me this:
>
>> iota
>Server:  localhost
>Address:  127.0.0.1
>iota.zoomtel.com    preference = 5, mail exchanger = iota.zoomtel.com
>zoomtel.com         nameserver = iota.zoomtel.com
>iota.zoomtel.com    internet address = 192.168.0.18
>
>> zoomtel.com
>Server:  localhost
>Address:  127.0.0.1
>zoomtel.com         preference = 10, mail exchanger = iota.zoomtel.com
>zoomtel.com         nameserver = iota.zoomtel.com
>iota.zoomtel.com    internet address = 192.168.0.18
>
>> epsilon
>Server:  localhost
>Address:  127.0.0.1
>*** No mail exchanger (MX) records available for epsilon
>
>> localhost
>Server:  localhost
>Address:  127.0.0.1
>*** No mail exchanger (MX) records available for localhost
>
>

                  Rodney Thayer           ::         rodney at sabletech.com
                  Sable Technology Corp   ::              +1 617 332 7292
                  246 Walnut St           ::         Fax: +1 617 332 7970     
                  Newton MA 02160 USA     ::  http://www.shore.net/~sable
                           "Developers of communications software"