Added support for sendmail service reload

Resolves: rhbz#1618552

sendmail.service

@@ -13,6 +13,9 @@ EnvironmentFile=-/etc/sysconfig/sendmail
 ExecStartPre=-/etc/mail/make
 ExecStartPre=-/etc/mail/make aliases
 ExecStart=/usr/sbin/sendmail -bd $SENDMAIL_OPTS $SENDMAIL_OPTARG
+ExecReload=/usr/bin/kill -HUP $MAINPID
+# hack to allow async reload to complete, otherwise systemd may signal error
+ExecReload=/usr/bin/sleep 2
 
 [Install]
 WantedBy=multi-user.target

sendmail.spec

@@ -19,7 +19,7 @@
 Summary: A widely used Mail Transport Agent (MTA)
 Name: sendmail
 Version: 8.15.2
-Release: 30%{?dist}
+Release: 31%{?dist}
 License: Sendmail
 Group: System Environment/Daemons
 URL: http://www.sendmail.org/
@@ -749,6 +749,10 @@ fi
 %endif
 
 %changelog
+* Wed Aug 29 2018 Jaroslav Škarvada <jskarvad@redhat.com> - 8.15.2-31
+- Added support for sendmail service reload
+  Resolves: rhbz#1618552
+
 * Mon Aug 20 2018 Jaroslav Škarvada <jskarvad@redhat.com> - 8.15.2-30
 - Fixed sendmail.pem unsafe: Group readable file