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- Newsgroups: comp.mail.sendmail
- Path: sparky!uunet!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: MX chaining to MXs?
- Message-ID: <1992Sep15.115200.11960@mp.cs.niu.edu>
- Organization: Northern Illinois University
- References: <193nr3INNd5k@plts.uucp>
- Date: Tue, 15 Sep 1992 11:52:00 GMT
- Lines: 22
-
- In article <193nr3INNd5k@plts.uucp> tal@plts.uucp (Tom Limoncelli) writes:
- >So, when a site tries to send to foo@hocc.org, the MX record will
- >redirect the message to warren.mentorg.com, which has a (wildcard) MX
- >record to go to rainbow.mentorg.com, which will know the real way to
- >get to warren.mentorg.com (since it is inside the firewall), which will
- >know how to deliver to hocc.org.
-
- No. You can't do that. MX records are not transitive (cannot be chained).
-
- Best method: Have an MX record pointing to rainbow.mentorg.com, and have
- that host set up to forward the message to warren.mentorg.com.
-
- Alternative method:
-
- hocc.org. IN MX 0 warren.mentorg.com.
- IN MX 10 rainbow.mentorg.com.
-
- A host will try to send to warren. The attempt will time out, and it will
- connect to the second choice of rainbow. The disadvantage is that every
- message will make a first false attempt, and some mailers don't try
- more than one MX address.
-
-