Set packed boolean when packing Netmail's is successful

app/Classes/FTN/Message.php

@@ -107,6 +107,8 @@ class Message extends FTNBase
 	private Collection $via;					// The path the message has gone using Via lines (Netmail)
 	private Collection $unknown;				// Temporarily hold attributes we have no logic for.
 
+	public bool $packed = FALSE;				// Has the message been packed successfully
+
 	// Convert characters into printable chars
 	// https://int10h.org/oldschool-pc-fonts/readme/#437_charset
 	private const CP437 = [
@@ -157,6 +159,7 @@ class Message extends FTNBase
 	{
 		$this->domain = $domain;
 
+		$this->header = [];
 		$this->kludge = collect();
 
 		$this->msgid = '';
@@ -392,9 +395,7 @@ class Message extends FTNBase
 	 */
 	public function __toString(): string
 	{
-		$return = '';
-
-		$return .= pack(collect(self::header)->pluck(1)->join(''),
+		$return = pack(collect(self::header)->pluck(1)->join(''),
 			$this->ff,
 			$this->tf,
 			$this->fn,