messages_notice_subject_before_save

apply_filters( 'messages_notice_subject_before_save', $this->subject, $this->id )

messages_notice_message_before_save

apply_filters( 'messages_notice_message_before_save', $this->message, $this->id )

apply_filters( 'messages_message_thread_id_before_save', $this->thread_id, $this->id )

apply_filters( 'messages_message_subject_before_save',   $this->subject,   $this->id )

apply_filters( 'messages_message_sender_id_before_save', $this->sender_id, $this->id )

apply_filters( 'messages_message_date_sent_before_save', $this->date_sent, $this->id )

apply_filters( 'messages_message_content_before_save',   $this->message,   $this->id )