+POP server. If
+.B \-sasl \-saslmech xoauth2
+is used, the HTTP transaction is also shown.
+.PP
+If
+.B nmh
+has been compiled with SASL support, the
+.B \-sasl
+switch will enable
+the use of SASL authentication. Depending on the SASL mechanism used, this
+may require an additional password prompt from the user (but the
+.I netrc
+file can be used to store this password, as described in the
+mh-profile(5) man page). The
+.B \-saslmech
+switch can be used to select a particular SASL mechanism.
+.PP
+If SASL authentication is successful,
+.B msgchk
+will attempt to negotiate
+a security layer for session encryption. Encrypted traffic is labelled
+with `(encrypted)' and `(decrypted)' when viewing the POP transaction
+with the
+.B \-snoop
+switch; see the
+.B post
+man page description of
+.B \-snoop
+for its other features.
+.PP
+If
+.B nmh
+has been compiled with OAuth support, the
+.B \-sasl \-saslmech xoauth2
+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 the service, which must
+be specified with the
+.B \-authservice
+.I service
+switch. Before using this, the user must authorize nmh by running
+.B mhlogin
+and grant authorization to that account. See the
+.B mhlogin
+man page for more details.
+.PP
+If
+.B nmh
+has been compiled with TLS support, the
+.B \-initialtls
+switch will require the negotiation of TLS when connecting
+to the remote POP server. The
+.B \-initialtls
+switch will negotiate TLS immediately after the connection has taken place,
+before any POP commands are sent or received. Data encrypted by TLS is
+labeled `(tls-encrypted)' and `(tls-decrypted)` with viewing the POP
+transaction with the
+.B \-snoop
+switch. The
+.B \-notls
+switch will disable all attempts to negotiate TLS.
+.PP
+When using TLS the default is to verify the remote certificate and SubjectName
+against the local trusted certificate store. This can be controlled by
+the
+.B \-certverify
+and
+.B \-nocertverify
+switches. See your OpenSSL documentation for more information on certificate
+verification.
+.SH FILES
+.fc ^ ~
+.nf
+.ta \w'%nmhetcdir%/ExtraBigFileName 'u