Glad to hear from you and know you found the root cause, the issue is
Considering the issue had been resolved, for the purpose to help other
people to get help from our experience, I would like to make a summary
here. If you have any further concern regard to this issue, feel free to
let me know.
One domain user account cannot send emails to the btinternet.com. email
just disappears into the thin air and XXXX@XXXXX.COM never receives
A Reverse DNS record issue
Modified A pointer (PTR) record which does not exist or is not valid for
the source SMTP server's IP address.
Here are some SBS 2003 server articles for your reference:
You are unable to send or receive SMTP messages from certain Internet
domains in Exchange 2000 Server, in Exchange Server 2003, and in Small
Business Server 2003
The "Perform Reverse DNS Lookup for Incoming Messages" Option Is for Host
Protecting Against Address Spoofing
Again, thank you for posting in the SBS newsgroups. Please feel free to
contact us again in the future.
Have a nice day!
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