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Quote:
Originally posted here by zENGER
I'm confused about the telnet part. Did you telnet to hotmails mail server and try to send a message? I surely hope this isn't possible, as that would constitute them having an open relay themselves. If you do that you mail should be lost. If you telnet to your own server on 25 and send a message what happens?
I guess it depends how you try to send an email through your telnet session.
With my session I tried to simulate a legit email coming in from a mail server.
Anything you try to send to somebody with/without a telnet session, will go through, if it's destined for the domain in question.
So here is how I did it:
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telnet mail.hotmail.com 25
helo
mail from:<[email protected]>
rcpt to:<[email protected]>
data
Testing email from College to Hotmail via telnet session...
.
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That should work to pretty much any mail server, I think at least??
Thanks for all the help!!
ps. Open relay is if I try to connect the same way, but instead of sending it to hotmail them selves, send it to [email protected] for example...
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Gone through all the links they had.. nothing.. !
Thanks though, that was a great site!! :)
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I telnet'd to their mail server and sent a message to my hotmail account, no love.
I then telnet'd to my SMTP server and sent a message to my hotmail account, it went through.
I'm not blacklisted, and yet my mail went into a blackhole. Try telneting to your own server and see if it goes through. This might shed some light on where in the process the break down is.
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Quote:
Originally posted here by zENGER
I telnet'd to their mail server and sent a message to my hotmail account, no love.
I then telnet'd to my SMTP server and sent a message to my hotmail account, it went through.
I'm not blacklisted, and yet my mail went into a blackhole. Try telneting to your own server and see if it goes through. This might shed some light on where in the process the break down is.
Hmm.. well.. I don't think I'm blacklisted either since I can't find myself on any black-hole list...
Still not sure what the deal is with Hotmail...
I can telnet to my own servers, I can telnet to my home charter cable account, I can probably telnet to your server... just Hotmail that seems to be odd...
I thought, maybe they have reverse DNS checkup filtering turned on, but I setup a DynDNS at home and sent a mail to hotmail and it went through fine as well.. which shouldn't have gone through, sine my IP would have resolved to a charter name instead of my DynDNS name...
I got a question about your mail server now though.. hehe! :)
You telnet'd to your SMTP server and sent a message to your Hotmail account?!?! Now that would be open relay, unless you did it from the mail server itself.. !? (or another server added to the trusted servers list allowed to relay)
Then try to telnet from any other workstation, to your SMTP server, and send it to your email address owned by that same SMTP server, and it should go through, from anywhere you connect...
Thanks for hanging in there!! Hopefully we will have everything cleared up before this thread is over.. heh!! :)
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Yeah, I telnet'd to it from itself. I just wanted to simulate a mail message being sent to see if hotmail would accept it.
Did you say if you telnet to your own server and send one to hotmail it goes through, but if the server itself sends one it doesn't? This leads me to think that its the mail server that is having the issue. In what manor are these alerts generated and how are they mailed?
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Quote:
Originally posted here by zENGER
Yeah, I telnet'd to it from itself. I just wanted to simulate a mail message being sent to see if hotmail would accept it.
Did you say if you telnet to your own server and send one to hotmail it goes through, but if the server itself sends one it doesn't? This leads me to think that its the mail server that is having the issue. In what manor are these alerts generated and how are they mailed?
OK, but if you try to telnet from home or from anywhere else, and try to send an email owned by that server it should work as well... that's not open relay, that's just how mail servers work... well.. except for hotmail that is... heh!
We have several apps. and web services that send email notifications to all the students, via their own SMTP services, so not realying through our main mail server.
Our main mail server, Groupwise, I thought didn't work either, but now it actually seems to work from it. But still not from any of the App. servers...
Making me confused, sounds like it is actually doing some sort of reverse DNS or verification of an "official" mail server source. Don't understand why my DynDNS worked from home in that case though.. !? Maybe it checks for an MX record.. ?
Email alerts are coming back with Fail to deliver, status code 4.4.7.
Probably should contact Hotmail directly...
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Oh, found new info in the SMTP logs.
The return code from the hotmail server is 250 on everything (which is good!), except for when it's about to get delivered, then the return code is 940!
I can't seem to find what 940 means though.. !?!?
Anyone?
Thanks!
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Alright, it looks like it's turning out to be a BIG problem, over at Microsoft.. and not on my end.. heh!!
I'm emailing them back and forth, they got such a lame support, at least the once I've been talking to so far...
Actually pretty funny for little me to correct Microsoft.. hehe! ;)
Will keep you updated! :)
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Since this thred lives in a non-front-page forum, and since the whole thread has changed to become a completely different problem than I first thought. (I Thought I had something messed up and not MS.. heh!?)
Maybe I should start a new thread that can be read by everybody, like 'Newbie Security'?
Hopefully then we can get all smart heads, joined together and figure all this out.. ?! And maybe correct Microsoft, if it actually is their fault?!? :)
See ya in 'Newbie Security Questions'!
