Exchange 2010 Error: 535 5.7.3. Authentication unsuccessful

I have a 3rd party application that requires SMTP to send invoices. My exchange environment is EXCH 2010. I went ahead and created a relay connector specifying correct IP addresses and
Authentication set to: TLS, Basic Authentication checked. Permission Groups: Anonymous Users, Exchange Servers checked. When I use my personal account it works, but when trying to use CUSTOMERSERVICE account gives me an Error: 535 5.7.3 Authentication Unsuccessful. I HAVE CHECKED THE PASSWORD FOR THE CUSTOMER SERVICE ACCOUNT AND AM ABLE TO LOG INTO OWA WITH IT.
This environment was transferred from legacy Exchange 03, I heave read that some permissions may have not migrated, please help.
yachtingpromotionsAsked:
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achaldaveCommented:
Does it work when you try to use other non admin user? Try enabling Exchange users on permission group.

Also since you are allowing anonymous access to the relay connector, leave the authentication fields empty in application configuration.
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yachtingpromotionsAuthor Commented:
CHECKING EXCHANGE USERS on permission group worked. Thank you.
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