Actually, spamdyke is correct -- that IP does not have a valid reverse DNS name. When I look up 10.221.34.64.in-addr.arpa, no PTR records are returned, only one CNAME record: mail.lassosoft.com. Queries for mail.lassosoft.com also return no PTR records, only A records. This setup is not valid; the best way to fix it would be to change the record for 10.221.34.64.in-addr.arpa from a CNAME to a PTR with the same value. I'm guessing whoever created the existing record didn't really understand how rDNS works and created a record that seemed close enough.
But to answer your question, yes! It is possible to turn off the rDNS filters for just that one IP. The feature you need is a configuration directory. Create a folder structure on the server like this: /some/path/_ip_/64/34/221 Then create a file in the deepest folder named "10": /some/path/_ip_/64/34/221/10 In that file, add the lines to turn off the rDNS filters: reject-empty-rdns=0 reject-unresolvable-rdns=0 Last, add a line to your main spamdyke config file to use the configuration directory: config-dir=/some/path That should do it! Full documentation of the configuration directory feature is here: http://spamdyke.org/documentation/README.html#CONFIGURATION_DIR -- Sam Clippinger On Aug 5, 2015, at 7:16 PM, Quinn Comendant via spamdyke-users <email@example.com> wrote: > We're experiencing blocked email due to a DENIED_RDNS_MISSING error, although > the domain PTR records do resolve: > > $ dig -x 184.108.40.206 +short > mail.lassosoft.com. > > Error: > > 2015-08-05 18:56:56.452648500 spamdyke: DENIED_RDNS_MISSING from: > donotre...@lassosoft.com to: u...@example.com origin_ip: 220.127.116.11 > origin_rdns: (unknown) auth: (unknown) encryption: TLS reason: (empty) > > I've seen the recent thread on this where Sam explains that it could be DNS > issues > (<https://firstname.lastname@example.org/msg02009.html>). > > My question is, can we whitelist an IP for the DENIED_RDNS_MISSING error? > > Quinn > _______________________________________________ > spamdyke-users mailing list > email@example.com > http://www.spamdyke.org/mailman/listinfo/spamdyke-users
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