troubleshooting Question

Reverse DNS Exchange 2010

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Bulls-Eye asked on
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I have an Exchange server 2010 with multiple domains.  The problem I have is some emails that go out would fail to a relay error.  I have my ISP setup a reverse dns but even with that it still fails to some selected emails that end users send.  

I tried to change my FQDN value i get a AuthMechinism on receiver connector error.  Can I have multilple FQDN so when other email server check my SMTP banner it replies correctly?  How is this all setup?

Thanks,
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