When discarded WHLO keywords are found, parse them into a list

Author: whyscream

50-filter-postfix.conf

@@ -297,13 +297,17 @@ filter {
             "postfix_delay_transmission", "float",
             "postfix_postscreen_violation_time", "float"
         ]
+        # Rewrite some extracted values
         gsub => [
-            # rewrite some extracted values
             "postfix_tls_policy_undecided", "\?", "true",
             "postfix_requiretls_policy_undecided", "\?", "true",
             "postfix_requiretls_policy_violation", "\!", "true",
             "postfix_requiretls", "requiretls", "true"
         ]
+        # Split a string containing a list of values into an actual list
+        split => {
+            "postfix_discarded_ehlo_keywords" => " "
+        }
     }
 
     # Convert timestamp fields from string to date

test_pipeline.sh

@@ -23,7 +23,7 @@ perform_cleanup() {
 trap perform_cleanup INT TERM
 
 echo Preparing input data
-echo "postfix/smtp[123]: 7EE668039: to=<admin@example.com>, relay=127.0.0.1[127.0.0.1]:2525, delay=3.6, delays=0.2/0.02/0.04/3.3, dsn=2.0.0, tls=dane/!requiretls:nostarttls, status=sent (250 2.0.0 Ok: queued as 153053D)" > "$INPUT"
+echo "postfix/smtp[123]: 7EE668039: to=<admin@example.com>, relay=127.0.0.1[127.0.0.1]:2525, delay=3.6, delays=0.2/0.02/0.04/3.3, dsn=2.0.0, tls=dane/!requiretls:nostarttls, status=sent (250 2.0.0 Ok: queued as 153053D)" >> "$INPUT"
 
 echo Preparing pipeline config
 cat > "$PIPELINE" << EOF