diff --git a/sendmail.spec b/sendmail.spec
index 0ac684417f524b74a15041f1e04d81c661ebb666..7cf08fb653995bbcffd6cb1353e45163e7d7ec98 100644
--- a/sendmail.spec
+++ b/sendmail.spec
@@ -1,6 +1,6 @@
 Name:          sendmail
 Version:       8.16.1
-Release:       3
+Release:       4
 Summary:       A classic mail transfer agent from the Unix world
 License:       Sendmail
 URL:           http://www.sendmail.org/
@@ -466,6 +466,12 @@ exit 0
 
 
 %changelog
+* Mon Mar 15 2021 Aichun Li <liaichun@huawei.com> - 8.16.1-4
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:add ExecStartPost in sm-client.service
+
 * Thu Sep 03 2020 zengwefeng <zwfeng@huawei.com> - 8.16.1-3
 - Type:NA
 - ID:NA
diff --git a/sm-client.service b/sm-client.service
index a450b164663612facb481afc6af9e442daaef154..e4d467d6985b092657804b1b77a197ff39bdfc50 100644
--- a/sm-client.service
+++ b/sm-client.service
@@ -15,6 +15,7 @@ ExecStartPre=/bin/chown smmsp:smmsp /run/sm-client.pid
 ExecStartPre=-/sbin/restorecon /run/sm-client.pid
 ExecStartPre=-/etc/mail/make
 ExecStart=/usr/sbin/sendmail -L sm-msp-queue -Ac $SENDMAIL_OPTS $SENDMAIL_OPTARG
+ExecStartPost=/usr/bin/sleep 0.1
 
 [Install]
 WantedBy=multi-user.target