Date: Wed, 20 Jan 1999 11:46:38 -0500 From: "Lawrence Hughes" <lawrence.hughes@mindspring.com> To: <freebsd-questions@FreeBSD.ORG> Subject: Re: DNS:concept quest.on run more than 1 mail server at same time Message-ID: <011001be4494$736eea90$3a01010a@lhughes.secureit.com>
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If I understand you correctly, you want to run redundant, parallel mail servers that will back each other up (and possibly share the load when both are running?). This is a somewhat difficult thing to do, esp. with tools from the late paleolithic period, such as Sendmail and QPopper. I happen to be creating a secure, scalable mail server right now (with exactly the high availability you described), but it is still in development, and will definitely not be freeware. I am building it on FreeBSD, though. What you need is multiple SMTP MTA front-end machines (with load balancing, e.g. DNS round robin), that can relay incoming messages to one or more back-end message store machines, and POP/IMAP that know to try connecting to the other one of a redundant pair if the first one they tries fails. Half of the front-end POP/IMAP machines can use one of the message store servers by default, half the other. If either goes down, the POP/IMAP servers that use that one should automatically switch to the remaining one. There are some interesting problems with keeping deletes synchronized between the two message stores, once the dead one comes back on-line. Somehow I don't think you're going to be able to do this with Sendmail & friends. Lawrence Hughes Author: Internet E-mail: Protocols, Standards and Implementation, Artech House, 1998. (see www.artech-house.com) -----Original Message----- From: Billy Ma <sbirdy@netvigator.com> To: freebsd-questions@FreeBSD.ORG <freebsd-questions@FreeBSD.ORG> Date: Wednesday, January 20, 1999 11:06 AM Subject: DNS:concept quest.on run more than 1 mail server at same time >Dear sir, > We have a web site that run qpopper on a freebsd, support >about 70 >persons, over 1000 mail per day, no joking, and recently, and we found >that >we need to setup more that one mail server, and I found some doc. how to > >defined, however, they all mention that defined more than one,In case >one >is down, the other can replace. > So, I have some question hope you can help. > >1. Does it mean I can only use one mail server,received & send at same >time, > the other is for backup only? > >2. If not, how to defined more than one mail server to run at same time, >AND > all users can defined ONLY ONE name in mail box preference e.g > users filled in netscape, mail.example.com at mail box name >field. > > mail IN CNAME mx1.example.com > IN CNAME mx2.example.com > >Is it OK? they can dynamic received and send mail, or my concept is >wrong? > >3. beside, any suggestion on pop3 program? do you think there are other >one > run on FreeBSD that better than qpopper? > > >THANK YOU!! > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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