diplodocus.org Git - nmh/blob - man/msgchk.man

   1 .TH MSGCHK %manext1% 2016-11-02 "%nmhversion%"
   2 .
   3 .\" %nmhwarning%
   4 .
   5 .SH NAME
   6 msgchk \- nmh's check for incoming email
   7 .SH SYNOPSIS
   8 .HP 5
   9 .na
  10 .B msgchk
  11 .RB [ \-help ]
  12 .RB [ \-version ]
  13 .RB [ \-date " | " \-nodate ]
  14 .RB [ \-notify
  15 all/mail/nomail ]
  16 .RB [ \-nonotify
  17 all/mail/nomail ]
  18 .RB [ \-host
  19 .IR hostname ]
  20 .RB [ \-user
  21 .IR username ]
  22 .RB [ \-sasl " | " \-nosasl ]
  23 .RB [ \-saslmech
  24 .IR mechanism ]
  25 .RB [ \-initialtls ]
  26 .RB [ \-notls ]
  27 .RB [ \-certverify " | " \-nocertverify ]
  28 .RB [ \-authservice
  29 .IR service ]
  30 .RB [ \-snoop ]
  31 .RI [ users
  32 \&... ]
  33 .ad
  34 .SH DESCRIPTION
  35 The
  36 .B msgchk
  37 program checks all known mail drops for mail waiting
  38 for you.  For those drops which have mail for you,
  39 .B msgchk
  40 will
  41 indicate if it believes that you have seen the mail in question before.
  42 .PP
  43 The
  44 .B \-notify
  45 .I type
  46 switch indicates under what circumstances
  47 .B msgchk
  48 should produce a message.  The default is
  49 .B \-notify
  50 .I all
  51 which says that
  52 .B msgchk
  53 should always report the status of the
  54 users mail drop.  Other values for `type' include `mail' which says that
  55 .B msgchk
  56 should report the status of waiting mail; and, `nomail'
  57 which says that
  58 .B msgchk
  59 should report the status of empty mail drops.
  60 The
  61 .B \-nonotify
  62 .I type
  63 switch has the inverted sense, so
  64 .B \-nonotify
  65 .I all
  66 directs
  67 .B msgchk
  68 to never report the status of
  69 mail drops.  This is useful if the user wishes to check
  70 .BR msgchk 's
  71 exit status.  A non-zero exit status indicates that mail was
  72 .I not
  73 waiting for at least one of the indicated users.
  74 .PP
  75 If
  76 .B msgchk
  77 produces output, then the
  78 .B \-date
  79 switch directs
  80 .B msgchk
  81 to print out the last date mail was read, if this can
  82 be determined.
  83 .SS "Using POP"
  84 .B msgchk
  85 will normally check all the local mail drops, but if
  86 the option \*(lqpophost:\*(rq is set in the mts configuration file
  87 \*(lqmts.conf\*(rq, or if the
  88 .B \-host
  89 .I hostname
  90 switch is given,
  91 .B msgchk
  92 will query this POP service host as to the status of
  93 mail waiting.
  94 .PP
  95 To specify a username for authentication with the POP server, use the
  96 .B \-user
  97 .I username
  98 switch.  The credentials profile entry in
  99 .IR mh\-profile (5)
 100 describes the ways to supply a username and password.
 101 .PP
 102 For debugging purposes, there is also a switch
 103 .BR \-snoop ,
 104 which will
 105 allow you to watch the POP transaction take place between you and the
 106 POP server.  If
 107 .B \-sasl \-saslmech xoauth2
 108 is used, the HTTP transaction is also shown.
 109 .PP
 110 If
 111 .B nmh
 112 has been compiled with SASL support, the
 113 .B \-sasl
 114 switch will enable
 115 the use of SASL authentication.  Depending on the SASL mechanism used, this
 116 may require an additional password prompt from the user (but the
 117 .I netrc
 118 file can be used to store this password, as described in
 119 .IR mh-profile (5).
 120 The
 121 .B \-saslmech
 122 switch can be used to select a particular SASL mechanism.
 123 .PP
 124 If SASL authentication is successful,
 125 .B msgchk
 126 will attempt to negotiate
 127 a security layer for session encryption.  Encrypted traffic is labelled
 128 with `(encrypted)' and `(decrypted)' when viewing the POP transaction
 129 with the
 130 .B \-snoop
 131 switch; see
 132 .IR post (8)'s
 133 description of
 134 .B \-snoop
 135 for its other features.
 136 .PP
 137 If
 138 .B nmh
 139 has been compiled with OAuth support, the
 140 .B \-sasl \-saslmech xoauth2
 141 switch will enable OAuth authentication.  The
 142 .B \-user
 143 switch must be used, and the
 144 .I user-name
 145 must be an email address the user has for the service, which must
 146 be specified with the
 147 .B \-authservice
 148 .I service
 149 switch.  Before using this, the user must authorize nmh by running
 150 .B mhlogin
 151 and grant authorization to that account.  See
 152 .IR mhlogin (1)
 153 for more details.
 154 .PP
 155 If
 156 .B nmh
 157 has been compiled with TLS support, the
 158 .B \-initialtls
 159 switch will require the negotiation of TLS when connecting
 160 to the remote POP server.  The
 161 .B \-initialtls
 162 switch will negotiate TLS immediately after the connection has taken place,
 163 before any POP commands are sent or received.  Data encrypted by TLS is
 164 labeled `(tls-encrypted)' and `(tls-decrypted)` with viewing the POP
 165 transaction with the
 166 .B \-snoop
 167 switch.  The
 168 .B \-notls
 169 switch will disable all attempts to negotiate TLS.
 170 .PP
 171 When using TLS the default is to verify the remote certificate and SubjectName
 172 against the local trusted certificate store.  This can be controlled by
 173 the
 174 .B \-certverify
 175 and
 176 .B \-nocertverify
 177 switches.  See your OpenSSL documentation for more information on certificate
 178 verification.
 179 .SH FILES
 180 .fc ^ ~
 181 .nf
 182 .ta \w'%nmhetcdir%/ExtraBigFileName  'u
 183 ^$HOME/.mh_profile~^The user profile
 184 ^%nmhetcdir%/mts.conf~^nmh mts configuration file
 185 ^%mailspool%/$USER~^Location of mail drop
 186 .fi
 187 .SH "PROFILE COMPONENTS"
 188 .fc ^ ~
 189 .nf
 190 .ta 2.4i
 191 .ta \w'ExtraBigProfileName  'u
 192 None
 193 .fi
 194 .SH "SEE ALSO"
 195 .IR inc (1),
 196 .IR mh\-mail (5),
 197 .IR post (8)
 198 .SH DEFAULTS
 199 .nf
 200 .RB ` user "' defaults to the current user"
 201 .RB ` \-date '
 202 .RB ` "\-notify\ all" '
 203 .fi
 204 .SH CONTEXT
 205 None