SOLVED Serious Mailman DMARC Bug

brianc

Well-Known Member
May 16, 2003
191
7
168
All of our mailman lists are no longer doing DMARC checks on or about Jan 6th. I believe the problem is with a cPanel update. We are seeing the following in the mailman error log:

Jan 16 19:24:18 2017 (7889) DNS lookup for dmarc_moderation_action for list <Listname>not available

This started on Jan 6th and since then we have had clients complaining of aol and hotmail mail users being removed from their lists even though DMARC settings were enabled.

I was told by the mailman developers to run "python -c "import dns.resolver"" for any errors, I get the following:

Traceback (most recent call last):
File "<string>", line 1, in <module>
ImportError: No module named dns.resolver

I believe this is a bug that was introduced by cPanel. I will be filling out a support ticket in regards to this but I am warning any other cPanel hosting providers to keep a look out for this since it can seriously disrupt an active mailman mailing list.

Brian
 

sneader

Well-Known Member
Aug 21, 2003
1,195
63
178
La Crosse, WI
cPanel Access Level
Root Administrator
Same exact problem here, causing a lot of grief for us.

I opened a ticket with cPanel, Ticket ID # 8136657.

- Scott
 

cPMelaniel

Technical Analyst Supervisor
Staff member
Jun 25, 2013
9
1
78
Houston,Tx
cPanel Access Level
Root Administrator
I've filed a case for our development team to investigate further (CPANEL-10869)

I also found a workaround to the issue by downgrading the installed version of cpanel-dnspython.

Thanks for bringing this issue to our attention! I'll be keeping an eye out on this forum page tonight if anyone has questions or concerns.
 
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sneader

Well-Known Member
Aug 21, 2003
1,195
63
178
La Crosse, WI
cPanel Access Level
Root Administrator
Here are the steps we performed on our cPanel servers, as provided by cPanel Tech Support, to get DNS lookups (for DMARC) working in Mailman again:

Code:
# rpm -e --nodeps cpanel-dnspython-1.12.0-3.cp1158.x86_64
# wget http://httpupdate.cpanel.net/RPM/11.58/centos/6/x86_64/cpanel-dnspython-1.12-1.cp1158.x86_64.rpm
# rpm -Uhv cpanel-dnspython-1.12-1.cp1158.x86_64.rpm
# /scripts/restartsrv_mailman
- Scott
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,909
2,227
463
Hello,

To update, the resolution is included as part of cPanel version 62.0.5:

Fixed case CPANEL-10869: Update cpanel-dnspython to 1.12.0-4.cp1158.

You can review the full cPanel version 62 change log at:

62 Change Log - Change Logs - cPanel Documentation

Thank you.
 

sneader

Well-Known Member
Aug 21, 2003
1,195
63
178
La Crosse, WI
cPanel Access Level
Root Administrator
Thanks, @cPanelMichael! We're still on v60, so we'll have to wait for this to trickle down to v60. Fortunately, the work around seems to be working well, other than the annoying nightly notices of "Altered RPMs" :)

- Scott
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,909
2,227
463
Hello @sneader,

The case is also scheduled for inclusion in a future cPanel version 60 build, but I don't have a specific time frame to offer on it's publication at this time.

Thank you.
 
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