The message "DENIED_RDNS_RESOLVE" means the remote server has an rDNS name but the name does not resolve to an IP address. The full list of possible messages is listed here:
http://www.spamdyke.org/documentation/README.html#LOG

To deactivate this filter, remove the "reject-unresolvable-rdns" option from your spamdyke configuration file.

-- Sam Clippinger

Eric C. Broch wrote:

Hello list,

Spamdyke is rejecting many legitimate emails with the DENIED_RDNS_RESOLVE flag. When I do a reverse lookup ‘nslookup <IP-Address>’ on these senders there is indeed a reverse record. Has anyone encountered this behavior in spamdyke? If so, what is the cause? I don’t want disable this option as it blocks many erroneous IP’s and unwanted email nor do I want to add entries to files unnecessarily.

Eric

Eric C. Broch

White Horse Technical Consulting


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