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How to resolve the various Undeliverables by Exchange 2003

Here's the complete error message (there are several like this)
:  sue@simplyelegantevents.biz on 10/2/2007 11:43 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <tskorman.com #5.7.1 smtp;554 5.7.1 Service unavailable; Client host [] blocked using dul.dnsbl.sorbs.net; Dynamic IP Addresses See: http://www.sorbs.net/lookup.shtml?

The irony is we are not listed on SORBS.net, I don't know whose IP address that is (not ours).
We're using GFI Mail Essentials but I tested with that service not running and it returns with the exact error message.  I'm also checking with GFI, awaitiing their response.  Frustrating!!
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1 Solution
Do the error messages refer to the same IP address every time?
Do you send email via another host?
Have you checked to see who the IP address is issued to, whether it is your ISP or not?

WHOIS says this

Final results obtained from whois.arin.net.
DSL.net, Inc. DSL-NET-5 (NET-208-41-0-0-1) -
Sunfast/Associates Realty IEN-SFASREAL (NET-208-41-190-160-1) -

# ARIN WHOIS database, last updated 2007-10-01 19:10
# Enter ? for additional hints on searching ARIN's WHOIS database.

1. Go to www.dnsstuff.com and let them have check your mail server, mx records, spam lists etc.
2. Check your reverse dns records
3. If you don't have SPF, make a DNS SPF record. SPF stands for Sender Policy Framework and each domain should have a SPF record in DNS. See www.openspf.org.
ValvatterottAuthor Commented:
The Email  Server used to go through DSL.NET until about a month ago, then these Undeliverables.
ValvatterottAuthor Commented:
The dynamic IP listed is always the same, it looks like DSL.NET's.  Maybe I should call them now?
I went through DNSstuff.com, checked through the MX, the Reverse DNS, and spam lists - all cool.
You have accepted my answer. Is the problem resolved?

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