Any responsible ISP ~must~ prevent every tom, dick and harry from relaying
thru his mailservers if he wants to prevent spam. See
http://www.orbs.org/otherresources.html for more info.
However, any sensible ISP must allow relaying from all those who are in its
IP block. If you are dialed into a mantra account, you have an IP from
Mantra's dialup IP pool, so Mantra must allow you to relay through its SMTP
server.
So, if you are on a standalone linux box try setting DM mantraonline.com in
sendmail.cf. If you are on a network, make sure NAT / IPMASQ is enabled
properly, so that the Mantraonline server doesn't see something like
10.0.0.xx
If it was an anti-relaying problem, Mantra would have bounced your mail with
a 550 we don't relay (or something similar). This is a totally different
problem IMHO.
Suresh Ramasubramanian | [EMAIL PROTECTED]
> -----Original Message-----
> From: Manu Viswanathan [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, April 10, 2000 5:10 PM
> To: [EMAIL PROTECTED]
> Subject: [LIH] sendmail hostname lookup failure
>
> they needed to do this to prevent spam "and other things." Would anyone
> know whether they really have to stop mail relaying to prevent spam?
>
[[SureshR]] Yes
> Anyhow, why is it that I can still send mail by pointing my mail client
> directly at del1.mantraonline.com but not through sendmail? Would it
> work if sendmail were to masquerade entirely (i.e., masquerade envelope,
>
[[SureshR]] Yes
> plus whatever else)? Perhaps when the sendmail identifies itself to
> Mantra's SMTP server, it identifies itself as my localhost's hostname
>
[[SureshR]] Sendmail will look for the ip you are connecting from.
> and maybe that's Mantra rejects it... (I really don't know:) Or is there
> an alternative (eg., qmail + maildir2smtp) to sendmail that will work
>
[[SureshR]] Is Mantra running sendmail? No. They are running
netscape messaging server, btw. Yet, that won't change the basic SMTP
protocol :) Post some contents of your /var/log/maillog
> around this problem? (Basically, I guess, I would need an SMTP server
> that would look to Mantra as if the mail is coming through the mail
> client...) TIA.
>
>
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