Weird Email issue, Recipients dont recieve every one

Diakatarnis

Diakatarnis

Diakatarnis

Associate
Joined
30 Jul 2003
Posts
442
Hi there,

I have a strange issue, and wondered if anyone had any suggestions?

My client has a exchange 2003 server using postini to recieven and send emails

99% of the emails go through fine, but he was in a email conversation with a friend, and after sending his response, there was no reply. The recipient hadnet recieved the email. this has happened with a talktalk address and 2 domain addresses.

Wird thing is that looking at message tracking on the server, it leaves the exchange organization fine and goes stratigh to postini, and looking at their logs it says it was delivered fine.

Now the other thing is that he also mentioned that he tried sending to the same recipient from his blackberry which is vodafones blackberry mail thin, and not connected to the exchange server in any way, and they didnt recieve that either.

So at the moment im stuck, as im pretty sure its not the server our end thats the problem as both the exchange server and the blackberry server are having the same issues.

Any thoughts?
 
Sounds like the recipients end to be perfectly honest.

If it left your site and you get no NDRs back then it sounds like it is vanishing into the ether, which is the behaviour of being on a blacklist (as well as some other things)

Do a mxtoolbox.com blacklist check on their and your domains.

While I would expect NO e-mails to be getting through I have seen stranger things happen :D Do the basics first, blacklist check is a good start.
 
none of our addresses are blacklisted, however one of the addresses were having issues sending too is.

Its only on 1 blacklist on mxtoolbox, but i dont know whether this causes a massive problem or just contributes to it?
 
1 blacklist is enough to mess things up. I have no idea what systems the receiver back end is using but it may be using a round-robin style blacklist check which is why most get through, but the odd one does not. I have never come across a system like this in person but it's more than possible.

At least start the process to get it removed while you look at other solutions.
 
looks like i either pay 50eur to get it removed of wait 4 weeks....

so that can explain 1 address but not the talktalk one...

Im wondering whether the emails are going into the recipients junk email box instead of their inbox.
 
im starting to think its probably more user error than anything else.

out of 1000+ emails a week only he has a problem, none of the other users seem to ....
 
Due to the proxy pass-through nature of the Postini services, if you are able to see the message leaving Postini and being accepted by the recipient server than I would lean toward this either being some time of Anti-Spam "feature" on the receiving side.

More often than not if a message is delivered but ends up in the recipients spam folder it is because administrative and regular users are able to adjust their own spam settings. Postini or any other email provider are not able to control everyone's settings, just their own. If a user has their spam settings set to a high level they could be causing problems and not even know it!

I wouldn't worry too much about Backscatter. It is not a RBL that is used for fully blocking mail (even their site says not to do this) and due to their delisting policies, I don't think it is highly used even for helping to judge as spam or not. We list it on our page for informational purposes only. We figure you would like to know if you are on it. Also, if this is one message in a conversation, then a blacklist is not likely to be the culprit.

Thanks,
@MxTooolBox
 
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