Description of problem:
This happens out-of-box in the background.
SELinux is preventing sendmail from 'read' accesses on the directory .esmtp_queue.

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

If you believe that sendmail should be allowed read access on the .esmtp_queue directory 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 sendmail /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:certwatch_t:s0-s0:c0.c1023
Target Context                system_u:object_r:mail_home_rw_t:s0
Target Objects                .esmtp_queue [ dir ]
Source                        sendmail
Source Path                   sendmail
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-128.1.fc22.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.0.5-300.fc22.x86_64 #1 SMP Mon
                              Jun 8 16:15:26 UTC 2015 x86_64 x86_64
Alert Count                   37
First Seen                    2015-04-20 16:11:02 EEST
Last Seen                     2015-06-20 03:13:01 EEST
Local ID                      bb7d8037-20f2-4de0-9236-47b572bb35f1

Raw Audit Messages
type=AVC msg=audit(1434759181.425:594): avc:  denied  { read } for  pid=5686 comm="sendmail" name=".esmtp_queue" dev="dm-1" ino=4488436 scontext=system_u:system_r:certwatch_t:s0-s0:c0.c1023 tcontext=system_u:object_r:mail_home_rw_t:s0 tclass=dir permissive=0


Hash: sendmail,certwatch_t,mail_home_rw_t,dir,read

Version-Release number of selected component:
selinux-policy-3.13.1-128.1.fc22.noarch

Additional info:
reporter:       libreport-2.6.0
hashmarkername: setroubleshoot
kernel:         4.0.5-300.fc22.x86_64
type:           libreport