SELinux blocking Dovecot from mysqld socket

I am working with Centos7:

I have configured Dovecot to connect to mysqld via socket:

connect = host=/var/lib/mysql/mysql.sock dbname=postfix user=postfix 
password=Postfix_Database_Password

I test sending a message with

sendmail -i [email protected] < README

This fails with the following message in maillog

Feb  4 11:28:48 klovia dovecot: dict(13122): Error: 
mysql(/var/lib/mysql/mysql.sock): Connect failed to database (postfix): 
Can't connect to local MySQL server through socket 
'/var/lib/mysql/mysql.sock' (13) - waiting for 25 seconds before retry

If I setenforce to 0, the connection works.  So it clearly is an SELinux 
problem.  I worked on this almost 2 years ago on another system and found:

http://zszsit.blogspot.com/2012/12/dovecot-mysql-selinux-issue-on-centos6.html

But I was hoping that there were better tools now with Centos7.  I 
checked for setsebool at:

https://linux.die.net/man/8/mysqld_selinux

and tried:

setsebool -P allow_user_mysql_connect 1

But the mail still does not go unless I setenforce to 0.

Is there someway to get SELinux to allow dovecot (and postfix) to 
connect to mysqld?

thank you

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