Update 'DSPAM/README.md'

Updated package -list to be installed

DSPAM/README.md

@@ -24,5 +24,5 @@ dnf group install "Development Tools"
 
 ###### Install primary required packages:
 ```
-dnf install wget nano tar unzip clamav-server postfix postgrey opendkim # clamav server is an alias for clamd
+dnf install wget nano tar unzip clamav-server postfix postgrey pypolicyd-spf opendkim # clamav server is an alias for clamd
 ```