troubleshooting Question

NDR : Recipient address rejected:User unknown in virtual alias table

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madinina asked on
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HI Exchange Expert,

I have exchange 5.5 SP4 on a Windows 2000 server with latest Services Packs.
I have a registered domain from my ISP
This domain is handle by may ISP. DNS report of this domain give : SOA IN 7200 Primary DNS server:
Responsible Name:
Serial:             2006080462
Refresh:            43200 (12h)
Retry:              3600 (1h)
Expire:             3600000 (5w 6d 16h)
Minimum/NegTTL:     1200 (20m) NS IN 7200 NS IN 7200 MX IN 7200 [Preference = 1] MX IN 7200 [Preference = 1]

I can send e mail to external domain. But they are received as spam. How can fix this ?????
When my friends send an email to me they receive this NDR message :

<>: does not like recipient.
Remote host said: 550 5.1.1 <>: Recipient address
rejected: User unknown in virtual alias table
Giving up on

Any tips how fix this issue ???

Thsk in advance
Stacy Spear
President/Principal Consultant

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