How to fix cPanel mailing list archiving functionality when link traversal protection is enabled

If link traversal protection is enabled on cPanel server, the mailman archiving feature stops working as it creates some internal symlinks in /usr/local/cpanel/3rdparty/mailman/archives/private/listname_domain.com/. You may notice the following error in /usr/local/cpanel/3rdparty/mailman/logs/error file:

Oct 19 23:49:21 2015 (532564) Uncaught runner exception: [Errno 2] No such file or directory Oct 19 23:49:21 2015 (532564) Traceback (most recent call last): File "/usr/local/cpanel/3rdparty/mailman/Mailman/Queue/Runner.py", line 119, in _oneloop self._onefile(msg, msgdata) File "/usr/local/cpanel/3rdparty/mailman/Mailman/Queue/Runner.py", line 190, in _onefile keepqueued = self._dispose(mlist, msg, msgdata) File "/usr/local/cpanel/3rdparty/mailman/Mailman/Queue/ArchRunner.py", line 73, in _dispose mlist.ArchiveMail(msg) File "/usr/local/cpanel/3rdparty/mailman/Mailman/Archiver/Archiver.py", line 216, in ArchiveMail h.processUnixMailbox(f) File "/usr/local/cpanel/3rdparty/mailman/Mailman/Archiver/pipermail.py", line 586, in processUnixMailbox self.add_article(a) File "/usr/local/cpanel/3rdparty/mailman/Mailman/Archiver/pipermail.py", line 623, in add_article self.new_archive(arch, archivedir) File "/usr/local/cpanel/3rdparty/mailman/Mailman/Archiver/pipermail.py", line 608, in new_archive self.open_new_archive(archive, archivedir) File "/usr/local/cpanel/3rdparty/mailman/Mailman/Archiver/HyperArch.py", line 1047, in open_new_archive os.symlink(self.DEFAULTINDEX+'.html',index_html) OSError: [Errno 2] No such file or directory

  To fix the issue you should add mailman user to 'linksafe' group, so it could manage symlinks as needed:

usermod -a -G linksafe mailman