I have an exchange 2007 sp1 running on windows 2008. I am currently having the following problem:
1. There is 1 domain that is giving me a delay error with 518.104.22.168. I can send emails both internally and externally with no problems except to this 1 email domain.
2. The email eventually gets sent after a some hours.
3. I tried to telnet to the user and recieved the 550 error as well. However, whenever i try to send email to anybody using telnet it gives me the 550 error.
Any ideas? mx and ptr records are all correct and I am not grey or blacklisted.