grok {
       patterns_dir => "patterns"
       match => [
            "message", "%{SYSLOGBASE} %{POSTFIXCLEANUP}",
            "message", "%{SYSLOGBASE} %{POSTFIXBOUNCE}"
        ]
        named_captures_only => true
    }

if "_grokparsefailure" not in [tags] {
   #database call
}

grok {
       patterns_dir => "patterns"
       match => [
            "message", "%{SYSLOGBASE} %{POSTFIXBOUNCE}"
        ]
        add_tag => ["BOUNCED"]
        remove_tag => ["_grokparsefailure"]
        named_captures_only => true
    }

    grok {
       patterns_dir => "patterns"
       match => [
            "message", "%{SYSLOGBASE} %{POSTFIXCLEANUP}"
        ]
        add_tag => ["INTIALIZATION"]
        remove_tag => ["_grokparsefailure"]
        named_captures_only => true
    }