Delivery to the following recipients has been delayed

Our CEO is getting this message when trying to send an email to an individual who uses Road Runner.  I followed the tenet instructions on another post here and I got an error when I did "rcpt to:". I got "550 #5.1.0 arress rejected." I tried a valid email address as well and got the same error. When I look at the outbound queue in Exchange Manager I see a blue check mark for that domain as well as one for I have an SPF record in place, reverse dns works, althougth the name of the Exchange Server shows up as Barracuda(which I installed about a month ago) with it's associated IP address instead of the name and IP of our Exchange Server. Any direction would be greatly appreciated. It's difficult explaining anything to our CEO.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

If it's saying the address is rejected, it sounds like perhaps the recipient's domain has blocked yours... potentially inadvertantly. I'd check with the recipient to ensure they didn't add your domain to their spam list.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
InSearchOfAuthor Commented:
Well, I went to their link for requesting removal of blocked status but apparently we are not listed in any of their blacklists. They provide links to check your IP address and it comes up OK.
InSearchOfAuthor Commented:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Email Protocols

From novice to tech pro — start learning today.