On 10/5/2012 8:47 AM, Mike Wills wrote:
I hope this is the place to ask this. I am getting the following
error.

Unable to deliver message to: <c***s@xxxxxxxxxx> Delivery failed for
the following reason: Server smtp.reliablesites.com[216.243.184.249]
failed with: 554 5.7.1 Service unavailable; Client host
[216.250.188.211] blocked using list.dsbl.org

What does it mean?

It means that someone has configured their mail server to block based on the DNSBL hosted by DSBL.ORG ... but DSBL has been shut down. It's common practice for DNSBL operators to configure their systems to always return a false positive when they have shut down their services in hopes that the mail server operators will get the message.

Should I be concerned?

Depends on if the mail you were trying to send to 'domain.com' is important.

You might want to check the whois database to see is responsible for domain.com and let them know.

david



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