- Go to http://spamcannibal.org/cannibal.cgi
- In the right side menu click Lookup IP
- Enter mail server IP address into the field and click Lookup IP
- Check why you got listed in the first place
- If your mail server is missing PTR (reverse DNS) record, add it
- If other problem resolve it first
- If the problem is resolved go again to http://spamcannibal.org/cannibal.cgi
- Click Contact in the right side menu
- Scroll to the bottom
- Enter your IP address
- Enter your Email
- Describe why you got listed and what you did to solve the problem
- Submit
Reason: [{LED=250 2.1.5 RESOLVER.GRP.Expanded; distribution list expanded};{MSG=};{FQDN=};{IP=};{LRT=}]
If you got this error checking the mail flow for a distribution group, it means the distribution group is closed and only internal senders can send e-mail to this group. When outside user sends e-mail to this group you get Reason: [{LED=250 2.1.5 RESOLVER.GRP.Expanded; distribution list expanded};{MSG=};{FQDN=};{IP=};{LRT=}] Set Delivery for this group to internal and external users and your problem will be solved.
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ERR_NAME_RESOLUTION_FAILED