Scott,
Yes, I can connect to every other SMTP server I've tried to connect to from
home (even AOL's if you can believe that). It is only hotmail's servers
that I can not connect to. The reverse DNS to my account at home shows it
is a cable IP (ool-18beaed3.dyn.optonline.net).
They could be blocking based on a reverse lookup, but they'd have some
serious problems with a lot of email servers that do not even have reverse
DNS set up (even though, yes, I know they should).
They must be blocking blocks of IPs. Could you really see them implementing
a block based on the return of a reverse DNS lookup? If so, are they only
blocking IPs that match a certain reverse DNS lookup, and allowing those
that have no reverse DNS set up?
When I try and connect from work, it is from an IP that has a reverse DNS
lookup set up on it, but it is NOT a mail server (I'm simply using telnet).
When I try to connect from home, it is the same situation, the only
difference is the IP I am connecting from, and the return of the reverse DNS
lookup for that IP. The other thing is, the connection refusal is immediate
when I try from home. There is no indication that their server is doing any
kind of reverse lookup before refusing my connection.
Chris
P.S. BTW, I don't have a mail server at home, I am simply trying to connect
from there to see if the hotmail thing was a network problem here. It was
then that I found out I could not connect to ANY hotmail servers from home.
I tried other random servers I picked just to make sure it wasn't that I was
unable to connect to any mail server from home, and that wasn't the case.
It seems to be only isolated to Hotmail at this time. That is why I blurted
out that they "could" be blocking an IP block that someone has a mail server
on, because it seems they are blocking certain IP blocks.
----- Original Message -----
From: "R. Scott Perry" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, February 26, 2003 10:57 AM
Subject: Re: [IMail Forum] SMTP Clogging.....
>The thing is, at the same time of the day, I can connect to 4 of the
hotmail
>servers successfully from work, but can connect to NONE of those same
>servers at home. I believe they are definitely implementing some sort of
>SPAM control, unless it's just dumb luck that every time I try from home it
>doesn't work, and every time I try from work it does.
If it *is* spam control, it's very poorly designed spam control, that is
going to waste Hotmail's bandwidth.
Are you sure that your ISP at home isn't blocking port 25 access (can you
connect to other SMTP servers from your account at home)? Does the reverse
DNS of your account at home show something that would indicate that it is a
personal account and not a business account?
-Scott
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