-\fBf <regexp>\fR (from) selects mails whose leading line From, or
-fields From:, or Reply-To: matches the regexp.
-.TP
-\fBt <regexp>\fR (to) selects mails whose field To:, Cc:, or Bcc: matches the regexp.
-.TP
-\fBp <regexp>\fR (participant) selects mails whose leading line From,
-or fields From:, Reply-To:, To:, Cc:, or Bcc: matches the regexp.
+\fBf <regexp>\fR (from)
+selects mails whose leading line From, or fields From:, Sender:,
+Reply-To:, or Return-Path: matches the regexp.