IP Name Possibly Forged
Posted on 2006-06-12
There is a user from another company trying to email a particular user at my company. The Sending user is receiving a Relaying Denied message and as a result, the receiving user (my company) is not receiving the message.
The Relaying Denied message is as follows (the names & IPs have been changed to protect the inocent):
Reporting-MTA: dns; myserver.mydomain.com
Final-Recipient: RFC82; firstname.lastname@example.org
X-Supplementarty-Info: <otherserver.otherdomin.local #5.7.1 smtp; 5.7.1
<email@example.com>...Relaying denied. IP nam possibly forged [18.104.22.168]>
X-Display-Name: MyuserLast, MyUserFirst
Note: I am assuming that other server.otherdomain.local is the sender's server.
I don't know if this is our problem or the sender's problem. There are no DNS errors in the event log. From what I can see, the reverse DNS lookup (via dnsstuff.com) looks okay (although I am not sure that I understand it). We are using a Postini service to scan incoming and outgoing mail for spam & viruses.
Any help would be greatly appreciated.
BTW: We are using SBS 2000.