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
<spamdyke-users@spamdyke.org> wrote:
> We're experiencing blocked email due to a DENIED_RDNS_MISSING error, although
> the domain PTR records do resolve:
>
> $ dig -x 64.34.221.10 +short
> mail.lassosoft.com.
>
> Error:
>
> 2015-08-05 18:56:56.452648500 spamdyke[5681]: DENIED_RDNS_MISSING from:
> donotre...@lassosoft.com to: u...@example.com origin_ip: 64.34.221.10
> 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://www.mail-archive.com/spamdyke-users@spamdyke.org/msg02009.html>).
>
> My question is, can we whitelist an IP for the DENIED_RDNS_MISSING error?
>
> Quinn
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> spamdyke-users@spamdyke.org
> http://www.spamdyke.org/mailman/listinfo/spamdyke-users
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