Incoming mail PTR records not resolving
Question asked by Robert Simpson - December 4 at 2:56 PM
Answered
(SM17 v6911) I submitted a ticket for this already and it's being investigated -- but is anyone else having a problem where all incoming mail is having the Received: header read "UnknownHost" ?

1.  Reverse DNS antispam check is passing, so incoming mail arrives just fine.
2.  The mail server sends and receives e-mail just fine, so DNS resolution is working
3.  SMTP logs report "PTR host name for XXX.XXX.XXX.XXX resolved as UnknownHost" for every incoming IP address, no exceptions.

9 Replies

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0
Linda Pagillo Replied
Hi Robert. Are you using an in-house DNS server with SmarterMail or are you using external servers such as Google's 8.8.8.8 and 8.8.4.4?
Linda Pagillo
Mail's Best Friend
Email: linda.pagillo@mailsbestfriend.com
Web: www.mailsbestfriend.com
Authorized SmarterTools Reseller
Authorized Message Sniffer Reseller
 
0
Dave Feuer Replied
I am getting this too.
Using our own in house DNS that work fine with 15.x & 16.x
-Dave
1
Robert Simpson Replied
Using google DNS
I should also point out that all these IP addresses that SM is saying are "unknownhost" will resolve properly if I use NSLOOKUP to reverse DNS them from the same mail server.

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Neil Harvey Replied
I am getting this too.
Using hosting DNS. Tried the google DNS servers and it still fails

v6898
Neil
1
Matt Petty Replied
Employee Post Marked As Answer
Hello thanks for reporting this. We have a fix for this issue. Contact me for a link to the build with fix. I've already sent the link to everybody here.

You can DM me by clicking my name and "Send Message"

Matt Petty
Software Developer
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
0
Robert Simpson Replied
Soooo close, Matt!!  

Received: from ms11p00im-qufo17291401.me.com (ms11p00im-qufo17291401.me.com. [17.58.38.43]) by mail.bcsft.com with SMTP     (version=TLS\Tls12     cipher=Aes256 bits=256);
There's now an extra dot after all the domain names.  They are resolving, though!

[2018.12.05] 01:16:51.471 [17.58.38.43][63688589] Performing PTR host name lookup for 17.58.38.43
[2018.12.05] 01:16:51.471 [17.58.38.43][63688589] PTR host name for 17.58.38.43 resolved as ms11p00im-qufo17291401.me.com.
[2018.12.05] 01:16:56.580 [66.220.144.170][9679072] Performing PTR host name lookup for 66.220.144.170
[2018.12.05] 01:16:56.580 [66.220.144.170][9679072] PTR host name for 66.220.144.170 resolved as 66-220-144-170.mail-campmail.facebook.com.
[2018.12.05] 01:17:20.879 [64.44.134.96][1540034] Performing PTR host name lookup for 64.44.134.96
[2018.12.05] 01:17:20.879 [64.44.134.96][1540034] PTR host name for 64.44.134.96 resolved as 96-134-44-64.reverse-dns.
[2018.12.05] 01:17:26.129 [119.40.92.18][6083222] Performing PTR host name lookup for 119.40.92.18
[2018.12.05] 01:17:26.129 [119.40.92.18][6083222] PTR host name for 119.40.92.18 resolved as 119-40-92-18.spnetctg.com.
[2018.12.05] 01:17:47.786 [203.160.61.120][37276343] Performing PTR host name lookup for 203.160.61.120
[2018.12.05] 01:17:47.786 [203.160.61.120][37276343] PTR host name for 203.160.61.120 resolved as 120.sub-61-160-203.hanastar.net.id.
[2018.12.05] 01:19:15.094 [17.110.71.106][3182004] Performing PTR host name lookup for 17.110.71.106
[2018.12.05] 01:19:15.094 [17.110.71.106][3182004] PTR host name for 17.110.71.106 resolved as mr28p00im-ztfo03015001.me.com.

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Dave Feuer Replied
Same, have the period but it is resolving.

[2018.12.04] 20:51:44.258 [74.113.33.55][41565236] Performing PTR host name lookup for 74.113.33.55
[2018.12.04] 20:51:44.258 [74.113.33.55][41565236] PTR host name for 74.113.33.55 resolved as mta55.connetrix.com.

-Dave
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Neil Harvey Replied
Hi Matt,

Same as above for me. 

many thanks
Neil
0
Robert Simpson Replied
Fixed in 6913.  Thanks guys!

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