Vivek:
You appear to believe that every message your server receives is
legitimate and should be delivered... a belief that was common in the
1980's and 1990's and resulted in SMTP (the protocol) being so very easy
to use for SPAM. We've learned our lesson, but are stuck in backward
compatibility hell and thus, about 80% of email hosting activities
these days is some form of SPAM control.
If you are receiving mail from a server that has no RDNS, you are most
likely receiving SPAM or mail from a mis-configured domain (or, in a
small percentage of cases - mail from a domain that just changed IP
addresses and forgot to have the RDNS entry created -- but that will be
very rare, and its on them to fix it! Your error message tells them what
is wrong, so they'll have to fix it themselves!).
Effective SPAM control requires that public mail servers (that is, the
ones that send mail from one domain to another) be on a static IP
address and have a valid (non-generic) PTR record on that IP address.
The RDNS_Missing message says that they didn't implement that PTR
record, and so you rejected it...
FWIW, Google, Yahoo!, Outlook, AOL, and all of the other big mail
providers will block those messages too!
As for the denied other message, you should look at other nearby lines
in the log file -- there is likely another program blocking it for virus
content or because its in an RBL you're subscribed to, or something similar.
One final word from me on this:
- whitelisting sending domains is something that should only be done
when the two domains (sending and receiving) are well known to each
other and have a legitimate reason for making sure all messages are
received. One example I have seen is that I whitelist the local
courthouse (clerk of the court) for my attorney clients so that legal
service emails are not processed for SPAM content.
My thoughts, my ideas... if you like them, keep them as your own... if
not, kindly discard them in an environmentally friendly manner! :-)
Dan McAllister
On 9/11/2013 1:12 AM, Linux wrote:
Hi All,
I have the problem with receiving the mails, when I go through SMTP
logs I found maximum error DENIED_RDNS_MISSING and DENIED_OTHER
If I put the domain in adjust whitelist senders, then it solved, but
there are lots of domain that I can't put it manually or monitor daily.
Please give me the best solution so that I can fixed that issue.
Regards,
Vivek Patil
system admin
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