So here we have an example of my ignorance in action.
Since my objective in trying to run everything myself
is to further expose said ignorance it looks like I'm
doing a good job.
Summarizing: Presumably RedHat (among others) rejects
my email because the "reverse DNS" or "reverse IP"
lookup of my SMTP host's IP does not resolve to my
SMTP's DNS hostname.
For those also in the darkness I refer you to
http://www.dnsstuff.com Running their "reverse DNS"
tool for my ISP assigned IP gives tons of useful
information including:
-----------------------------------
<snip>The reverse DNS entry for an IP is found by
reversing the IP, adding it to "in-addr.arpa", and
looking up the PTR record. So, the reverse DNS entry
for 66.47.111.74 is <snip>
user-112urqa.biz.mindspring.com.
-----------------------------------
... not as I would have wanted, www.RiverAlph.com. I
further refer you to:
http://www.dnsstuff.com/info/revdns.htm
a "reverse DNS" FAQ.
Your suggestion that I "set your sendmail to forward
all outbound mail to {ISP's SMTP}" appears to be an
acceptable solution although it is an "ISP dependancy"
which I'd hoped to avoid. When I figure out how to do
that I'll probably be in good shape. Can I leave my
MX as myself still? (I would think that this would be
necessary.)
Again, just to push back the frontiers of darkness,
presumably all of this is unnecessary when you have a
real "assigned IP"?
=Paul=
__________________________________
Do you Yahoo!?
Protect your identity with Yahoo! Mail AddressGuard
http://antispam.yahoo.com/whatsnewfree--- Begin Message ---
Well, I know that if you don't have a reverse DNS entry that many will reject
mail from you. I thought from your original post that you did. The "www"
maybe a flag for them. Many broadband providers, for instance, will give you
a static but on their DNS the IP resolves to user1.dsl.someISP.com or
something. You can, however, use your ISP's smtp server as a smart host and
avoid such problems as rejections like this. Because you are part of your
ISP's network, it's smtp server will relay for you because to it you are
local. So set your sendmail to forward all outbound mail to smtp.yourisp.com
and then test your mail. This works for my setup.
<<JAV>>
---------- Original Message -----------
From: Paul Gillen <gillen1951@xxxxxxxxx>
To: Red Hat User List <redhat-list@xxxxxxxxxx>
Sent: Thu, 13 Nov 2003 18:57:11 -0800 (PST)
Subject: Fwd: Re: Mail error: reason: 550 5.0.0 You must use a valid mail
server
> I'm pretty sure that you're right, that RedHat is
> rejecting this as a spam check, i.e. that the mailing
> host should be resolvable as the message origin. My
> problem is that, as far as I can see, it is.
>
> Depending upon what set of settings I use other mail
> works from fitfully to pretty good. (And believe me,
> I've tried a lot of settings.)
>
> =Paul=
>
> __________________________________
> Do you Yahoo!?
> Protect your identity with Yahoo! Mail AddressGuard
> http://antispam.yahoo.com/whatsnewfree
------- End of Original Message -------
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