From: Mr Nobody <nobody@example.com>
To: Somebody <somebody@example.com>
Subject: Test
-Nmh-Attachment: $MH_TEST_DIR/attachment.txt
+Attach: $MH_TEST_DIR/attachment.txt
This is a test.
EOF
From: Mr Nobody <nobody@example.com>
To: Somebody <somebody@example.com>
Subject: Test
-Nmh-Attachment: $MH_TEST_DIR/attachment.txt
+Attach: $MH_TEST_DIR/attachment.txt
¡Ay, caramba!
EOF