+.PP
+If
+.B nmh
+has been compiled with OAuth support, the
+.B \-oauth
+switch will enable OAuth authentication. The
+.B \-user
+switch must be used, and the
+.I user-name
+must be an email address the user has for that service. Before using this,
+the user must authorize nmh by running
+.B mhlogin
+and grant authorization to that account. Only
+.B -oauth
+.I gmail
+is supported. See the
+.B mhlogin
+man page for more details.
+.PP
+Gmail only supports POP3 over TLS, but
+.B inc
+has no TLS support. To work around this, use something like
+.B -proxy 'openssl s_client -connect %h:995 -CAfile /etc/ssl/certs/ca-certificates.crt -quiet'