Sendmail configuration:

[Dawes, Stephen]

Thanks, you have given me some ideas as to what I am doing wrong in my approach.
So I am going to undo some of what I have already done and attack the problem with your approach.
I am looking to getting all up and running, and when I do so, I will drop you a line as to the final outcome. (off line if you prefer)

I do appreciate the need to stay on topic, so no offence taken by your response.




Stephen Dawes  <B.A., B.Sc.>
The City of Calgary                   |  Phone: (403) 268-5527
   Web Business Office #8300          |  Fax:   (403) 268-6423
   PO Box 2100 Postal Station M.      |  Email: Stephen.Dawes at calgary.ca
   Calgary, Alberta, Canada. T2P 2M5  |  Web:  http://www.calgary.ca

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> -----Original Message-----
> From: Julian Field [mailto:mailscanner at ECS.SOTON.AC.UK]
> Sent: 2002 November 20 11:48 AM
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: Sendmail configuration:
> 
> 
> I don't quite see why you need to run MailScanner on a 
> different box from 
> your mail server, if you are using sendmail or Exim on the 
> mail server. It 
> just adds extra complication and really doesn't gain you very much.
> 
> You need to set up your mail server to accept mail from your 
> "MailScanner" 
> box, and you need to set up your MailScanner box so that it 
> receives mail 
> from the outside world and relays it onto the mail server for you.
> 
> You should do *all* of that before you think about installing 
> MailScanner 
> itself.
> Test it.
> Make sure it all works.
> 
> Only once you are happy that the mail is going to and from the right 
> places, with all the right addresses and headers, should you install 
> MailScanner on the box that faces the outside world.
> 
> MailScanner does not get involved with the SMTP service, nor 
> the delivery 
> or addressing of any email that passes through it.
> 
> So installing MailScanner won't affect the path that mail 
> takes through 
> your systems, which is why you should get them all working first.
> 
> You might want to ask this list if there is someone who could 
> privately 
> help you set up your mail system the way you want it, but 
> otherwise that is 
> OT (off-topic) for this list. Get back to us when you install 
> MailScanner 
> itself. I'm not being rude or anything, I hope you won't take 
> offence, none 
> is intended. But I do like to keep this list reasonably "on 
> topic" and 
> general mail setup information discussions aren't really relevant to 
> MailScanner itself.
> 
> Jules.
> 
> At 17:19 20/11/2002, you wrote:
> >New to MailScanner, I have a few questions about configuring 
> sendmail to 
> >work the way that I would like it too.  However, before I ask the 
> >questions, I would like to let you know that I think that I 
> have done my 
> >homework first.
> >To outline what I have done so far before posting my questions is:
> >1. Read the on-line installation documentation.
> >2. read through the on-line FAQs.
> >3. Did a number of searches on the list archives for answers 
> to my questions.
> >4. Went to and read the information available at www.sendmail.org .
> >5. Searched the internet in general for what I was looking for.
> >So, now it is to the list that I am turning to see if I have 
> found the 
> >right answers, and further more, to share what I found in 
> hopes that it 
> >will one day help someone else.
> >
> >Scenario:
> >I would like to have MailScanner running on one computer 
> with the mail 
> >server located on a second box.
> > From the link, Deploying MailScanner with Microsoft 
> Exchange Server or 
> > Postfix
> >(or any other unsupported mail server), which points the 
> reader to Q16 of 
> >the of the Installation FAQ, I gather that this is not out 
> of the ordinary 
> >and that it indeed can be done. In fact, I observed that 
> there are some 
> >instructions on how to do it. However, as a home linux user, 
> I did not 
> >quite understand all that was being explained. So I went 
> looking for more 
> >information to hopefully help me out. After a few days of 
> digging around, 
> >I uncovered the following information.
> >
> > >From the Web site:
> >http://www.tropicseas.net/reference/sysadmin/html/v09/i02/a6.htm
> >I read the article "A Linux Email Server" by Marcel Gagné. 
> In this article 
> >he talks about "Setting up Sendmail". (see below for excerpts)
> >My question are, would a configuration like that discussed 
> in Marcel's 
> >article:
> >1. work with MailScanner.
> >2. fit my scenario for my home linux network?
> >
> > >From the article:
> >"Depending on how your account is set up with your ISP, the 
> domain name of 
> >your server may be something like dhch3-ip1.theirdomain.com 
> , which is not the
> >best name for setting up the email gateway. For a return 
> address, user 
> >"fred" would wind up as fred at dhcp3-ip.theirdomain.com, when 
> sending mail 
> >from the
> >local system. You can have the Sendmail program put in your 
> domain name by 
> >making the one modification that I recommend in the Sendmail 
> configuration 
> >file.
> >I mentioned that this email server is not going to be 
> connected to the 
> >Internet, but if you make this easy change now, you won't 
> need to do it later.
> >
> >Using your editor, open /etc/sendmail.cf and look for the 
> lines shown in 
> >Listing 1. Notice the part that talks about my official 
> domain name. The 
> >line that
> >reads Dj$w.Foo.COM has been copied and rewritten with the 
> domain name to 
> >define the "Dj" macro. A macro in Sendmail parlance is very 
> much like an 
> >environment
> >variable in your Bourne, Korn, or C shell. The Dj macro 
> references your 
> >canonical hostname. For this article, I'll call the domain 
> mycompany.com.
> >
> >That is the only change needed in the /etc/sendmail.cf file. 
> The next file 
> >to modify is /etc/sendmail.cw. This file contains a list of 
> all the domains and
> >systems for which the server will accept mail. For instance, 
> if you edit 
> >the file with your editor, and add the domain name 
> (mycompany.com) and the 
> >localhost
> >name (localhost), you end up with this simple file:
> >
> ># sendmail.cw - include all aliases for your machine here.
> >mailserv
> >mailserv.mycompany.com
> >mycompany.com
> >localhost
> >
> >This tells the Sendmail daemon to accept mail messages 
> addressed to either 
> >user at localhost, or user at mycompany.com, or any of the aliases 
> you have set up.
> >Next, you need to edit /etc/mail/relay-domains.
> >
> >One of the great annoyances of modern email is SPAM (those 
> unwanted bits 
> >of advertising that seem to rain down in your email box). 
> Particularly galling
> >are the spammers who use other people's email servers to 
> route their mail 
> >traffic. Fortunately, the modern incarnations of Sendmail 
> make it difficult for
> >spammers to use your machine as a relay. In fact, unless otherwise 
> >specified, Sendmail will refuse to deliver messages from unfamiliar 
> >machines or domains.
> >That is where the relay-domains file comes into play. Edit 
> the file and 
> >add the following:
> >
> >localhost
> >127.
> >mycompany.com
> >192.168.1.
> >
> >This should cover all hosts in your small, networked office, 
> including any 
> >need you have for using Sendmail to relay messages on the 
> server. Be sure to
> >include the dot at the end of your localhost domain address 
> (127.) and at 
> >the end of your private network and domain (192.168.1.)."
> >
> >AND
> >
> >"That's all you really need to do with Sendmail and IMAP in 
> order to send 
> >and receive mail on this small network.
> >
> >To DNS or Not to DNS
> >
> >For Sendmail to route mail properly, it must be able to 
> resolve domain 
> >names to IP addresses. An email server operating on the 
> Internet uses DNS 
> >servers
> >for name resolution.
> >
> >Simply put, a DNS, or Domain Name Server, takes a system's 
> IP address and 
> >converts it to a more "human" name (like 
> mailserv.mycompany.com). It will also
> >convert that name back to its numeric IP address. On the server, 
> >mailserv.mycompany.com would become 192.168.1.100, or 
> vice-versa. This 
> >requires the setup
> >of "zone" files and domain tables and can be quite complex. 
> For the small 
> >network here, it is easier to list 
> host-to-name-to-IP-address mappings in the
> >/etc/hosts file:
> >
> >127.0.0.1       localhost
> >192.168.1.100   mailserv.mycompany.com   mailserv   mycompany.com
> >192.168.1.31    john
> >192.168.1.32    myrtle
> >192.168.1.33    bonnie
> >192.168.1.34    gilbert
> >192.168.1.35    elvis
> >192.168.1.36    tux
> >
> >Usually, the standard Linux install fires up with a DNS 
> already present. 
> >This is a simple version called a "caching nameserver". For 
> this example, 
> >you need
> >to get rid of it or it will try to use the DNS to resolve 
> the address of 
> >the local machine. The mail client will usually time out 
> waiting for the system
> >to return with a failed DNS lookup, which is not a good 
> idea. The easiest 
> >way is to rename the /etc/resolv.conf file:
> >
> ># mv /etc/resolv.conf /etc/resolv.conf.orig
> >
> >Next, stop the DNS by shutting down the named daemon:
> >
> ># /etc/rc.d/init.d/named stop
> >
> >To make sure named does not restart on boot, use this command:
> >
> ># chkconfig --del named
> >
> >Of course, if your network has been set up for a while and 
> you have a 
> >fully configured DNS, you should simply continue using it."
> >
> >For the full article:
> >http://www.tropicseas.net/reference/sysadmin/html/v09/i02/a6.htm
> >
> >
> >Thanks!
> >
> >
> >Steve Dawes
> >PH:  (403) 268-5527.
> >Mailto:  sdawes at calgary.ca
> >
> >
> >
> >NOTICE::
> >This communication is intended ONLY for the use of the 
> person or entity 
> >named above and may contain information that is confidential 
> or legally 
> >privileged. If you are not the intended recipient named 
> above or a person 
> >responsible for delivering messages or communications to the 
> intended 
> >recipient, YOU ARE HEREBY NOTIFIED that any use, 
> distribution, or copying 
> >of this communication or any of the information contained in it is 
> >strictly prohibited. If you have received this communication 
> in error, 
> >please notify us immediately by telephone and then destroy 
> or delete this 
> >communication, or return it to us by mail if requested by 
> us. The City of 
> >Calgary thanks you for your attention and cooperation.
> 
> --
> Julian Field                Teaching Systems Manager
> jkf at ecs.soton.ac.uk         Dept. of Electronics & Computer Science
> Tel. 023 8059 2817          University of Southampton
>                              Southampton SO17 1BJ
>