SELinux is preventing /usr/bin/python2.7 from using the signal access on a process.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that python2.7 should be allowed signal access on processes labeled postfix_postdrop_t by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep fail2ban-server /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp


Additional Information:
Source Context                system_u:system_r:fail2ban_t:s0
Target Context                system_u:system_r:postfix_postdrop_t:s0
Target Objects                Unknown [ process ]
Source                        fail2ban-server
Source Path                   /usr/bin/python2.7
Port                          <Unknown>
Host                          server.interlinx.bc.ca
Source RPM Packages
Target RPM Packages
Policy RPM                    selinux-policy-3.13.1-60.el7_2.9.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     server.interlinx.bc.ca
Platform                      Linux server.interlinx.bc.ca
                              3.10.0-327.28.3.el7.x86_64 #1 SMP Thu Aug 18
                              19:05:49 UTC 2016 x86_64 x86_64
Alert Count                   33
First Seen                    2016-06-27 23:23:49 EDT
Last Seen                     2016-09-18 00:53:32 EDT
Local ID                      b1eecb90-3c8b-4024-9334-024e301c3e3b

Raw Audit Messages
type=AVC msg=audit(1474174412.129:3186): avc:  denied  { signal } for  pid=15268 comm="fail2ban-server" scontext=system_u:system_r:fail2ban_t:s0 tcontext=system_u:system_r:postfix_postdrop_t:s0 tclass=process


type=AVC msg=audit(1474174412.129:3186): avc:  denied  { signal } for  pid=15268 comm="fail2ban-server" scontext=system_u:system_r:fail2ban_t:s0 tcontext=system_u:system_r:system_mail_t:s0 tclass=process


type=SYSCALL msg=audit(1474174412.129:3186): arch=x86_64 syscall=kill success=yes exit=0 a0=ffff8ecb a1=f a2=0 a3=0 items=0 ppid=1 pid=15268 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=fail2ban-server exe=2F7573722F62696E2F707974686F6E322E373B3537646437333764202864656C6574656429 subj=system_u:system_r:fail2ban_t:s0 key=(null)

Hash: fail2ban-server,fail2ban_t,postfix_postdrop_t,process,signal