554 error

554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
Some emails are not delivering.
Thank you.
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Valentina PerezExchange ServersCommented:
Hi Baiju,

You need to verify if you have your mail correctly configured:

-Make sure that the reverse DNS entry at your Internet Provider is in place and is it correct.

-Check the SPF records in place in your public DNS.

-Verify if you are generating spam.


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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Your email server may have been blacklisted. If you can find out the IP address of your server, go to http://network-tools.com/ and do a blacklist lookup. You'll get more information there.
Seth SimmonsSr. Systems AdministratorCommented:
check that your domain is not on any blacklist

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Zaheer IqbalTechnical Assurance & ImplementationCommented:
Please check your mail domain has not been blacklisted www.mxtoolbox.com
BAIJU GAuthor Commented:
Thank you for all the comments.
Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Baiju, you chose an answer that had several suggestions. Would you mind sharing what was the problem?
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