public function fromList($value): self
    {
        $value = collect($value)->implode(self::SEPARATOR);
        $this->has("list:{$value}");

        return $this;
    }
public function fromList($value): self
    {
        $value = collect($value)->implode(self::SEPARATOR);
        $this->has("list:{$value}");

        return $this;
    }
public function fromList ( $ value ) : self { $ value = collect ( $ value ) -> implode ( self :: SEPARATOR ) ; $ this -> has ( "list:{$value}" ) ; return $ this ; }
Filter a message if it was sent from a mailing list.

@param string|array $value The mailing list address

@return $this
Filter a message if it was sent from a mailing list .