REjected emails due to dynamic IP

When i send and email to a few domains i get a rejection as per below
------------------------------------------------------------
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <ntbm.NTBM.local #5.7.1 smtp;554 5.7.1 Rejected 202.52.41.155 is a dynamic IP>
------------------------------------------------------------
when i do a search on www.dnsstuff.com i get a different IP address for optusnet.com.au
if i ping it from my local machine i get correct resolution to 211.29.132.105

i have full administrative privalages on the server so i do not believe it is permission based.
Any help appreceiated.
LVL 19
Andrew DavisManagerAsked:
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.

SembeeCommented:
The message you are getting means what it says, and there is only one resolution.

A lot of ISPs don't believe that anyone on DSL or cable should be running their own email server and trying to deliver email directly. Your email should be delivered via your ISPs SMTP server.

Therefore you will have to route email for domains that reject your email for this reason via your ISP using an SMTP Connector.

http://www.amset.info/exchange/smtp-connector.asp

Simon.
Exchange MVP.

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
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
Exchange

From novice to tech pro — start learning today.