home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.mail.sendmail
- Path: sparky!uunet!walter!att-out!pacbell.com!ames!saimiri.primate.wisc.edu!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!mp.cs.niu.edu!rickert
- From: rickert@mp.cs.niu.edu (Neil Rickert)
- Subject: Re: problems with ultrix sendmail: i refuse to talk to myself
- Message-ID: <1992Dec14.184232.26867@mp.cs.niu.edu>
- Keywords: sendamil, ultrix, MX
- Organization: Northern Illinois University
- References: <1992Dec14.084352.29295@wega.rz.uni-ulm.de>
- Date: Mon, 14 Dec 1992 18:42:32 GMT
- Lines: 52
-
- In article <1992Dec14.084352.29295@wega.rz.uni-ulm.de> gaissmai@xwini.rz.uni-ulm.de (Karl Gaissmaier) writes:
-
- >MikroVax-3100
- >ULTRIX V4.2 (Rev. 85)
- >Sendmail-5.57
- >
- >This machine (netway.rz.uni-ulm.de) is our domain name server and MX-Server
- >for various other machines. netway is also our backup MailExchanger for
- >mathematik.uni-ulm.de, see below:
-
- > mathematik.uni-ulm.de preference = 0, mail exchanger = laborix.mathematik.uni-ulm.de
- > mathematik.uni-ulm.de preference = 5, mail exchanger = titania.mathematik.uni-ulm.de
- > mathematik.uni-ulm.de preference = 100, mail exchanger = netway.rz.uni-ulm.de
- > mathematik.uni-ulm.de preference = 200, mail exchanger = noc.belwue.de
-
- >in the case, that both MX-Servers laborix.mathematik.uni-ulm.de and
- >titania.mathematik.uni-ulm.de are down at the same time, all mails
- >for mathematik.uni-ulm.de are sent to netway.rz.uni-ulm.de.
- >
- >The netway now doesn't queue the mails until the more precedenced
- >MX_Servers laborix or titania are online, netway tries to connect
- >with itself and in order to prevent loops, netway can only say:
- > i refuse to talk to myself
-
- You need to make sure that $w is defined to be 'netway.rz.uni-ulm.de'
-
- If sendmail does not automatically define it this way try adding a
- line
-
- Dwnetway.rz.uni-ulm.de
-
- to your configuration. You may then have to make some other changes
- to avoid double domains.
-
- [Explanation: sendmail check an MX record against $w. If they are equal
- it discards this MX record and any record of worse preference. Thus if
- the two main hosts are down it should now queue the mail rather than
- send to itself].
-
- >but thats not my only problem with sendmail on ultrix.
- >We have the following wildcard-MX-RR's:
-
- The best solution here is to not use wildcard MX records. Instead explicitely
- list MX records for every valid name. Then anything invalid will be
- bounced with 'host unknown'. Best of all, the bouncing will often be
- done at the origination site, so the mail never reaches you.
-
- If you retain the wildcard MXs, the correct definition of $w, as
- described above, will help somewhat. The mail will still bounce, but there
- will be no attempt to connect to itself. Instead you will probably get
- a message "configuration error - host not recognized as local".
-
-