[Mailmunge] Mailmunge::Response syntax

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Some follow up questions in the same theme.

Does Mailmunge::Response->REJECT(...) need to be returned by the filter_*{} or does it get set and checked after the filter returns?

   sub filter_recipient {
     return Mailmunge::Response->REJECT(...);
   }

   sub filter_recipient {
     Mailmunge::Response->REJECT(...);
     return;
   }

Do these two work the same? The reason i ask is because there is $ctx->message_rejected. Does $ctx->message_rejected get defined when the response is invoked?

   sub filter_recipient {
     Mailmunge::Response->REJECT(...);
     return if $ctx->message_rejected;
     ...
   }

Is that ^^^ valid?
And is there something like $ctx->message_rejected but for knowing if Mailmunge::Response->CONTINUE() was used to do something like this?

   sub filter_recipient {
     if ($condition1) {
       Mailmunge::Response->REJECT(...);
     } elseif ($condition2) {
       Mailmunge::Response->CONTINUE();
     }
     if ($ctx->message_rejected || ??? ) {return;}
     ...
   }