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CDOSYS and Hotmail

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thekiwi View Drop Down
Mod Builder Group
Mod Builder Group


Joined: 23 November 2003
Location: New Zealand
Status: Offline
Points: 392
Post Options Post Options   Thanks (0) Thanks(0)   Quote thekiwi Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2004 at 6:43pm
Originally posted by andrew_ andrew_ wrote:

thekiwi : did you quote the wrong person?

If you meant to quote me... Thats really beside the point. Whether or not that should be the issue, it makes total sense. My IP Address does not resolve to the same domain as the sender because im being virutally hosted. Changing the code as I showed fixed the issue and allowed me to send through to hotmail and msn OK.

My guess is that you have inadvertantly corrected a problem somewhere else ... and more likely your default from address was/is incorrect.  THis can be a simple imput error, or a DNS misconfiguration in your domain details.  But if it works for you ... hey ... good stuff. 

To illustrate, my DEV environment is on an internal network (10.0.0.8) with a mails server (10.0.0.2) being used for relaying.  Its on a Dynamic IP Address and I can send to Hotmail, Yahoo etc etc accounts.  If you reverse lookup my SMTP relay IP Address you will get my ISP's FQDN.  If you reverse lookup on my FROM address and resolve its MX you will get my hosting server somewhere else in the world.  Remember, not all domains have/need an IP Address .. and a lot just have an MX record.

Quote

DP was right on... A reverse dns look-up does not resolve the senders domain with the ip. Thats dead on, and was my case to the T.

Good stuff ... but in computer fault finding your process does not imply cause and effect.

For example, I can send to my hotmail account using a faked Email address from my ISP's DSL connection ... the FROM address can be literally anything (in my tested cases) and all work fine.

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It would be a great addition to the codebase if a reversedns lookup could be performed, or even directly inputted into the config and used in that fashion. It just works.

Good stuff ... but Im almost 99% sure you are bypassing an error in your forum config and/or your domains setup (eg at a DNS level).

Like I offered b4, if you send us the URL of your forum and/or the Email address you are using to send from ... we can test.

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dpyers View Drop Down
Senior Member
Senior Member


Joined: 12 May 2003
Status: Offline
Points: 3937
Post Options Post Options   Thanks (0) Thanks(0)   Quote dpyers Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2004 at 11:05pm

Don't have the links for aol/msn that referenced this problem, but this is the one from yahoo http://help.yahoo.com/help/us/mail/spam/spam-17.html. The other two had something similar about reverse dns.

One of my previous web hosts had a notice posted that because of this reverse dns problem, we should use their smtp server - mail.webhost.com rather than domain servers. Apparently they made some subsequent arrangement with the big three to bypass the check for mail coming from their range of ip's because we were later able to use our domain servers without a problem.

I currently run my own dns servers and alias all my smtp's to one common/master smtp server. No problems with either dedicated or shared ip's as long as I specify the domain smtp server instead of localhost.

There was some discussion in alt.www.webmaster a while ago about one of the msn mail servers being "bad" as mail sent to recipients on that particular server was subject to erratic bounces, but I forget the details.

If I were you andrew, I'd follow-up on thekiwi's offer. My gut (a laaarge one!), tells me there may be something interesting to learn here. A lot of the behaviors of the big 3's mail services seems inconsitent and I'd like to know the results of thekiwi's tests.



Edited by dpyers

Lead me not into temptation... I know the short cut, follow me.
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andrew_ View Drop Down
Newbie
Newbie


Joined: 27 October 2003
Status: Offline
Points: 19
Post Options Post Options   Thanks (0) Thanks(0)   Quote andrew_ Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2004 at 10:40am

LOL I love comments like that (a laaarge one!).

Ill fire you a prvmsg probably some time this weekend thekiwi and see what we can figure out.

I love support threads like this which pull together so much good information!

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