From: Alice To: list@example.org Mime-version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="boundary" Content-Disposition: inline --boundary Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Mallory's message goes here. --boundary Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Mallory's signature goes here. -----END PGP SIGNATURE----- --boundary Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Email copied from Alice, a list member, goes here. --boundary Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Alice's signature goes here. -----END PGP SIGNATURE----- --boundary--