Reply to: Len Conrad
Re: [IMail Forum] Problems sending to earthlink.net on Friday 12:24:12 PM
Watch out for some ISPs and the way they manipulate their
customers. We have for some time seen problems on Mindspring
and Earthlink, and AT&T where it appears they block certain
email ports or, at the least, do not resolve or block other
mailservers. Some customers we have fixed by having them use
IP numbers rather than name resolutions in Outlook or other
readers. Of course, the same person on any other connection
has no such problems with the recommended settings.
This does not apply so much to sending to Earthlink, and the like,
but more to customers logging into Earthlink, then trying to
access our Imail for email. We had a user on Earthlink residential
DSL even yesterday who could not even see our Imail server with
an IP or name resolution in Outlook. Yet the same user could use
our Imail web mail with the same IP or name request. They could
use the very same server, but not with the identical settings in
Outlook.... so obviously ports are blocked or DNS resolution just
'never shows up' for some port request. If we switch them to their
own DNS here, this most often still doesn't fix the problem.
A few years ago we used AT&T dialups for testing a dialup software
product, and when we logged into other dialups and tried to access
email with a reader on their mail system, we could not. The answer
by calling AT&T was, of course, to use AT&T dialups and you won't
have these problems... "We don't allow access to our email services
accept through AT&T dialups or connections." That may have changed
since then, at least since more web mail is now being used.
Of course most of this is done for 'security purposes' but forces
the user (sometimes a whole company) to reconsider which email services
they should use if they outsource. Of course, you should be using
Earthlink, Mindspring, or AT&T, and 'you won't have those problems'.
--
Roger Heath
----- Copy of Original Message(s): -----
>>My iMail server is working flawlessly, and has been working great for more
>>than 3 years.
L> that's no excuse
>> Now, all of a sudden, we can't seem to send mail to any
>>account on earthlink.net. We can send to anyone else, it's just earthlink
>>that's bouncing our mail back. The bounce messages give no valuble
>>information, just "undeliverable to [EMAIL PROTECTED]".
L> I set up a list server for an Imail user in LaLaLand, his customer sent
L> 175k msgs, with 1000's to earth sometthing or other. boom, all their MX's
L> started refusing with "unknown user" but if you telnetted from another ip,
L> sent mail to the unknown user, it was accepted.
>>Is it possible that Earthlink is doing a reverse DNS lookup on domains that
>>send email to their server?
L> anything's possible.
>>I currently do not have proper PTR records
L> that doesn't help,
>>, as
>>I only have a small block of IPs, and I'm having problems getting my
>>provider to delegate authority to my DNS servers (please excuse me if my
>>teminology is wacked, I'm not a real DNS guy).
L> telnet to the MX from an ip different from your Imail ip to see if they've
L> blacklisted imail's ip.
L> Len
L> http://MenAndMice.com/DNS-training
L> http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
L> http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
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