RE: Sendmail Question

From: Ow Mun Heng (Ow.Mun.Heng_at_wdc.com)
Date: 05/17/04

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    To: "'For users of Fedora Core releases'" <fedora-list@redhat.com>
Date: Mon, 17 May 2004 13:23:26 -0700

    On Sun, 2004-05-16 at 05:40, Cowles, Steve wrote:
    > Ow Mun Heng wrote:
    > > Is this correct behaviour? I thought that to send emails you need to
    > > either be authenticated (SMTP auth) or be on the same IPs as your
    > > ISP??
    > >
    > > Or is this what's happening? Sendmail is actually querying DNS root
    > > servers and then upon getting the MX server, it connects straight to
    > > port 25 of that MX Server and sends it? If that's the case, what's
    > > stopping it from being a relay???
    > >
    > > /curious
    >
    > By default, redhat configures sendmail (actually sendmail.mc) to only accept
    > smtp requests from localhost. You would have to override that setting to
    > have sendmail accept smtp requests from other hosts on your LAN. The maillog
    > entry prior to the one you posted should show where the e-mail in question
    > was submitted from. Based on your post where you stated you have NOT
    > modified sendmail.mc, I'd be willing to bet it was submitted from localhost.
    > Take a look!
    >
    > As for your concern about being an open-relay... even if you were to modify
    > sendmail.mc and allow sendmail to accept smtp connections from another host

    Nope. I'm not concerned about being an open relay. I know i"m not. I'm
    just curious on how mails gets sent to the recipients. Alexander posted
    a longish answer to that. Still digesting it, but I think I sort of
    understand how things flow. 

    -- 
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