feat: instance IP address envvar

config/services.yaml

@@ -21,6 +21,7 @@ services:
         bind:
             $mailerSenderEmail: '%mailer_sender_email%'
             $mailerSenderName: '%mailer_sender_name%'
+            $outgoingIp: '%env(string:OUTGOING_IP)%'
 
     # makes classes in src/ available to be used as services
     # this creates a service per class whose id is the fully-qualified class name