Re: More on Masquerading

From: Alexander Dalloz (alexander.dalloz_at_uni-bielefeld.de)
Date: 08/16/04

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    Date: Mon, 16 Aug 2004 21:03:23 +0200
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Am So, den 15.08.2004 schrieb Ow Mun Heng um 12:19:

    > What exactly does genericstable do? (Sorry, writing this mail off-line)

    Please read my explanations in the posting I just wrote for Harry.

    > My Problem.

    > @work = mails must be sent out using the corp exhange server (smart host
    > feature _must_ be implemented via sendmail.mc)
    >
    > @home = mails are sent out w/o using smart host. Meaning, I have to
    > actively re-compile sendmail.mc each time between office and home to
    > send out emails. Cause @home, mails gets relayed directly to the
    > receipient's MX.

    You use the same email address @wdc.com from work too at home? Can you
    use the business mail server as smart host as well from at home (SMTP
    AUTH)?

    > > It is not an internet FQDN, just my own made up domain for my local
    > > lan. Therefore will never be resovable by dns lookups.
    > Just as I thought. And what/how does this affect mail sending?

    It will lead to rejects by foreign MTAs. For SPAM fighting most MTAs
    meanwhile don't accept mail with 'faked' sender addresses.
     
    > > My attempt at using generics tables consisted of adding:
    > > (see sendmail2.mc below for the full settings)
    > >
    > > FEATURE(`genericstable')dnl
    > > FEATURE(`generics_entire_domain')dnl
    > >
    > > And to /etc/mail/genericstable:
    > > reader reader@newsguy.com
    > What does this achieve? I don't see a genericstable in my
    > /etc/mail/ directory

    You have to create a genericstable your own, if you like to use that
    one. For each domain in class {G} - the generics-domains listing is
    missing here - the sender address on the left side in the genericstable
    map file is rewritten to what is to be found on the right hand side.

    > > Aug 14 19:31:34 reader sendmail[12324]: i7F0VTsA012322:
    > > to=<reader@jtan.com>, ctladdr=<reader@reader.local.net0> (500/500),
    > > delay=00:00:04, xdelay=00:00:04, mailer=relay, pri=120355,
    > > relay=smtp.newsguy.com. [129.250.170.69], dsn=5.6.0, stat=Data format
    > > error
    >
    > What's data format error? And I see that your relay is =
    > smtp.newsguy.com, which resolves to your Inet Public IP.

    smtp.newsguy.com is Harry's ISP's smart host MTA.

    > For my case, it gets relayed to the localhost (127.0.0.1)'s smtp. which
    > then hands it over to sendmail to contact the MX.

    Yes, this is part of communication between Harry's Sendmail and the
    smart host.

    > What I want to know is, is there a way to say that I want mails to be
    > sent out 1st using the Direct approach, if it fails then fall back to
    > the smart host.
    >
    > Something like /etc/host.conf
    >
    > user$ cat host.conf
    > order hosts,bind
    >
    > pseudo code :
    > if [check if it's a local address ]; then
    > pass to local sendmail
    > elif [check if we can send direct to MX ]
    > pass to sendmail for direct MX
    > else # when all else fails
    > pass to smart host for relay

    If I remember correctly there is no such fallback order.
    Do you use different mail addresses at work and at home? Then you could
    use smarttable. Else I would suggest not using the smart_host definition
    in the sendmail.mc file, but to use the mailertable instead. That makes
    switching a bit easier: you don't need to restart the Sendmail daemon
    because you don't change the sendmail.mc/.cf file but the mailtertable
    hashed map file: edit the mailertable file and run "make -C /etc/mail"
    and your change takes place immediately. See

    http://www.sendmail.org/m4/mailertables.html

    on how to set the entry for your smart host. To deactivate simply put a
    # in front of it to directly speak to the recipient MTAs.

    > Ow Mun Heng

    Alexander 

    -- 
Alexander Dalloz | Enger, Germany | GPG key 1024D/ED695653 1999-07-13
Fedora GNU/Linux Core 2 (Tettnang) kernel 2.6.7-1.494.2.2smp 
Serendipity 20:18:18 up 12 days, 13:45, load average: 0.16, 0.18, 0.12 



    


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