Add spamassassin start and enable at boot.

There appears to be an issue when using Debian 11 where spamassassin won't register to start at boot, and even in a post-install rebooted state, will not be running.  Perhaps I am incorrect, but I think this is a useful addition that makes sure this is all set up to operate as you intended.  I am not much of a systemd guy, but I think this is the correct way to do this.  It appears to work on a server I used this script on.  Please reject if superfluous or unnecessary.

Thanks for your work automating the "really fun" part of all this!

emailwiz.sh

@@ -309,6 +309,10 @@ for x in spamassassin opendkim dovecot postfix; do
 	service "$x" restart && printf " ...done\\n"
 done
 
+# Start the SpamAssassin process, and ensure SpamAssassin starts on boot.
+/etc/init.d/spamassassin start
+systemctl enable spamassassin.service
+
 # If ufw is used, enable the mail ports.
 pgrep ufw >/dev/null && { ufw allow 993; ufw allow 465 ; ufw allow 587; ufw allow 25 ;}