1MSGCHK(1) General Commands Manual MSGCHK(1)
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6 msgchk - nmh's check for incoming email
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9 msgchk [-help] [-version] [-date | -nodate] [-notify all/mail/nomail ]
10 [-nonotify all/mail/nomail ] [-host hostname] [-user username]
11 [-sasl | -nosasl] [-saslmech mechanism] [-initialtls] [-notls]
12 [-certverify | -nocertverify] [-authservice service] [-snoop]
13 [users ... ]
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16 The msgchk program checks all known mail drops for mail waiting for
17 you. For those drops which have mail for you, msgchk will indicate if
18 it believes that you have seen the mail in question before.
19 The -notify type switch indicates under what circumstances msgchk
21 should produce a message. The default is -notify all which says that
22 msgchk should always report the status of the users mail drop. Other
23 values for `type' include `mail' which says that msgchk should report
24 the status of waiting mail; and, `nomail' which says that msgchk should
25 report the status of empty mail drops. The -nonotify type switch has
26 the inverted sense, so -nonotify all directs msgchk to never report the
27 status of mail drops. This is useful if the user wishes to check
28 msgchk's exit status. A non-zero exit status indicates that mail was
29 not waiting for at least one of the indicated users.
30 If msgchk produces output, then the -date switch directs msgchk to
32 print out the last date mail was read, if this can be determined.
33 Using POP
35 msgchk will normally check all the local mail drops, but if the option
36 “pophost:” is set in the mts configuration file “mts.conf”, or if the
37 -host hostname switch is given, msgchk will query this POP service host
38 as to the status of mail waiting.
39 To specify a username for authentication with the POP server, use the
41 -user username switch. The credentials profile entry in the mh-pro‐
42 file(5) man page describes the ways to supply a username and password.
43 For debugging purposes, there is also a switch -snoop, which will allow
45 you to watch the POP transaction take place between you and the POP
46 server. If -sasl -saslmech xoauth2 is used, the HTTP transaction is
47 also shown.
48 If nmh has been compiled with SASL support, the -sasl switch will
50 enable the use of SASL authentication. Depending on the SASL mechanism
51 used, this may require an additional password prompt from the user (but
52 the netrc file can be used to store this password, as described in the
53 mh-profile(5) man page). The -saslmech switch can be used to select a
54 particular SASL mechanism.
55 If SASL authentication is successful, msgchk will attempt to negotiate
57 a security layer for session encryption. Encrypted traffic is labelled
58 with `(encrypted)' and `(decrypted)' when viewing the POP transaction
59 with the -snoop switch; see the post man page description of -snoop for
60 its other features.
61 If nmh has been compiled with OAuth support, the -sasl -saslmech
63 xoauth2 switch will enable OAuth authentication. The -user switch must
64 be used, and the user-name must be an email address the user has for
65 the service, which must be specified with the -authservice service
66 switch. Before using this, the user must authorize nmh by running
67 mhlogin and grant authorization to that account. See the mhlogin man
68 page for more details.
69 If nmh has been compiled with TLS support, the -initialtls switch will
71 require the negotiation of TLS when connecting to the remote POP
72 server. The -initialtls switch will negotiate TLS immediately after
73 the connection has taken place, before any POP commands are sent or
74 received. Data encrypted by TLS is labeled `(tls-encrypted)' and
75 `(tls-decrypted)` with viewing the POP transaction with the -snoop
76 switch. The -notls switch will disable all attempts to negotiate TLS.
77 When using TLS the default is to verify the remote certificate and Sub‐
79 jectName against the local trusted certificate store. This can be con‐
80 trolled by the -certverify and -nocertverify switches. See your
81 OpenSSL documentation for more information on certificate verification.
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84 $HOME/.mh_profile The user profile
85 /etc/nmh/mts.conf nmh mts configuration file
86 /var/mail/$USER Location of mail drop
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89 None
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92 inc(1), mh-mail(5) post(8)
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95 `user' defaults to the current user
96 `-date'
97 `-notify all'
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100 None
101nmh-1.7.1 2016-11-02 MSGCHK(1)