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- Newsgroups: comp.mail.mh
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!mp.cs.niu.edu!rickert
- From: rickert@mp.cs.niu.edu (Neil Rickert)
- Subject: Re: Differences invoking sendmail or using socket (localhost,SMTP)
- Message-ID: <1992Dec17.192457.6234@mp.cs.niu.edu>
- Organization: Northern Illinois University
- References: <VIXIE.92Dec16113711@cognition.pa.dec.com> <MRL.92Dec17092427@sun4.uai.com> <2B30CAD2.24855@ics.uci.edu>
- Date: Thu, 17 Dec 1992 19:24:57 GMT
- Lines: 38
-
- In article <2B30CAD2.24855@ics.uci.edu> jromine@buckaroo.ics.uci.edu (John Romine) writes:
- >mrl@uai.com (Mark R. Ludwig) writes:
- >>I'm reticent to configure N outlying workstations to use SMTP directly
- >>to our single mail hub, since I don't want to ... lose mail if the
- >>hub is busy, hung, or dead.
- >
- >You can give a list of MTAs to contact in the "servers:" line of the
- >MH mtstailor file. For better fault-tolerance, you could list some
- >servers which belong to another department or organization. I have
-
- This [the use of other departments or organizations] doesn't work if
- local users send local mail without hostnames on the recipient address.
- The address will be interpreted as in the domain of the server contacted
- instead of the sending domain.
-
- >>My understanding is that mail can be dropped if the hub is not accepting
- >>SMTP for a time, and the system from which mail is being sent cannot
- >>maintain the background process (due to crash, reboot, ...
- >
- >In this case, when you "send", MH will say that no servers are available.
-
- When sendmail is "not accepting connections" due to load average, the
- connection is actually made by the daemon but no accept() is executed.
- The sender sees this as a connection which is completed but then times
- out. I've seen post sitting in a sleep/retry loop for an extended period
- when this happens. Of course perhaps it was really doing the retry in
- an attempt to send a message saying that no server was available :-( .
-
- >If you have a group of diskless workstations and one file server, it's
- >pretty obvious that running an MTA only on the file server (and letting
- >the clients post mail with SMTP) is the way to go. The workstations
- >won't be doing much if the file server is down; they don't need an MTA.
-
- Except you need sendmail on the clients anyway, since not all mail uses
- MH. I haven't tried the recently announced release yet, but the
- pseudo-sendmail in the MH package is useless for this purpose on 6.7.2.
- It rejects messages that a normal sendmail would accept.
-
-