+This conversion occurs before all other processing.
+.PP
+If, however, a
+.I MIME-Version
+header field is already present in the draft, no such conversion
+will be done. This way, it is possible to access the full
+capabilities of
+.B mhbuild
+to create elaborate MIME structures, which reach way beyond the
+attachment system's capabilities.
+If
+.B mhbuild
+was invoked on the draft beforehand (e.g. at the Whatnow prompt),
+then
+.B send
+will use this already MIMEified draft as is.
+.PP
+As a second conversion step,
+.B send
+searches for
+.I Sign
+and
+.I Enc
+header fields, and if found, invokes
+.B mhsign
+to sign and encrypt the message. Signing and encrypting is done
+independently of the MIME conversion.
+.PP