blargoe wrote: If it reaches your SMTP server, it will be logged if you have logging enabled on your SMTP virtual server. When you say you are checking your Exchange logs, are you checking the SMTP logs? They would be in system32\logfiles\smtpsvc1 by default, I think. You need the entire error from the other company, not just the error number. The NDR will tell you not only the error but the envelope info and the name of the server that is actually doing the rejecting.
famosbrown wrote: It will definitely help to get a copy of the NDR they are receiving to help out the troubleshooting of the issue. I have experienced this same thing many times. Every issue was resolved by getting a copy of their NDR sent to a personal account. Examples of a few issues I've ran into: Keywords in certain messages triggered the Email Spam Filter to trap the message before even hitting the Exchange Server. If the sender was a key customer, we whitelisted their domain, and/or questioned the contents of the email after inspection. Customer had load balancing SmartHost using different DNS Providers and one of the servers could not resolve mail going out to us correctly. Customer got with ISP/DNS Provider to resolve issue. Customer had an external IP that had been blacklisted before on one of their smart host or Exchange Server. Once an IP gets on a blacklist, it takes some time to get the IP delisted or you would just have to request a new one from the ISP. So many possibilities, but without the NDR they are receiving, it is hard to tell why the messages aren't getting thorugh from their organization to yours.
Smallguy wrote: blargoe wrote: If it reaches your SMTP server, it will be logged if you have logging enabled on your SMTP virtual server. When you say you are checking your Exchange logs, are you checking the SMTP logs? They would be in system32\logfiles\smtpsvc1 by default, I think. You need the entire error from the other company, not just the error number. The NDR will tell you not only the error but the envelope info and the name of the server that is actually doing the rejecting. those are the logs I am looking at I've requested they send me the complete error message but so far they're not co-operating it is actually quite frustrating because I am attempting to work with them but not getting anywhere since they refuse to respond to any thing we ask and just keep pushing the blame over on us I for one will not place blame anywhere unless I'm certain and always co-operate with third parties to resolve issues
Smallguy wrote: famosbrown wrote: It will definitely help to get a copy of the NDR they are receiving to help out the troubleshooting of the issue. I have experienced this same thing many times. Every issue was resolved by getting a copy of their NDR sent to a personal account. Examples of a few issues I've ran into: Keywords in certain messages triggered the Email Spam Filter to trap the message before even hitting the Exchange Server. If the sender was a key customer, we whitelisted their domain, and/or questioned the contents of the email after inspection. Customer had load balancing SmartHost using different DNS Providers and one of the servers could not resolve mail going out to us correctly. Customer got with ISP/DNS Provider to resolve issue. Customer had an external IP that had been blacklisted before on one of their smart host or Exchange Server. Once an IP gets on a blacklist, it takes some time to get the IP delisted or you would just have to request a new one from the ISP. So many possibilities, but without the NDR they are receiving, it is hard to tell why the messages aren't getting thorugh from their organization to yours. thanks for the reply I'm trying to get the NDR the odd thing is that mail does flow sometimes then randomly stops I have white listed their domain on our server as soon as I get the NDR I will post it and see what the guru's here have to say. so far it's been 2 days of calling trying to speak with people who do not return phone calls I'm hoping that if I receive no response tomorrow the people putting pressure on me can get some pressure put on the other company to at least contact me with the info I've requested.
blargoe wrote: Smallguy wrote: blargoe wrote: If it reaches your SMTP server, it will be logged if you have logging enabled on your SMTP virtual server. When you say you are checking your Exchange logs, are you checking the SMTP logs? They would be in system32\logfiles\smtpsvc1 by default, I think. You need the entire error from the other company, not just the error number. The NDR will tell you not only the error but the envelope info and the name of the server that is actually doing the rejecting. those are the logs I am looking at I've requested they send me the complete error message but so far they're not co-operating it is actually quite frustrating because I am attempting to work with them but not getting anywhere since they refuse to respond to any thing we ask and just keep pushing the blame over on us I for one will not place blame anywhere unless I'm certain and always co-operate with third parties to resolve issues If it's an important customer or contact, then you should maybe escalate it to your manager and let him know that you are not getting the information you need from the other side. That will cover your butt. You can't troubleshoot this without have additional information. If they aren't that important, screw 'em.
