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CentOS 7.0 - man page for pop3test (centos section 1)

POP3TEST(1)						      General Commands Manual						       POP3TEST(1)

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NAME
pop3test - interactive POP3 test program
SYNOPSIS
pop3test [ -t keyfile ] [ -p port ] [ -m mechanism ] [ -a userid ] [ -u userid ] [ -k num ] [ -l num ] [ -r realm ] [ -f file ] [ -n num ] [ -s ] [ -c ] [ -i ] [ -o option=value ] [ -v ] hostname
DESCRIPTION
pop3test is a utility that allows you to authenticate to a POP3 server and interactively issue commands to it. Once authenticated you may issue any POP3 command by simply typing it in. It is capable of multiple SASL authentication mechanisms and handles encryption layers transparently. This utility is often used for testing the operation of a pop3 server. Also those developing POP3 clients find it useful.
OPTIONS
-t keyfile Enable TLS. keyfile contains the TLS public and private keys. Specify "" to negotiate a TLS encryption layer but not use TLS authentication. -p port Port to connect to. If left off this defaults to pop3 as defined in /etc/services. -m mechanism Force pop3test to use mechanism for authentication. If not specified the strongest authentication mechanism supported by the server is chosen. Specify user to use the USER/PASS commands or apop to use the APOP command instead of AUTH. -a userid Userid to use for authentication; defaults to the current user. This is the userid whose password or credentials will be presented to the server for verification. -u userid Userid to use for authorization; defaults to the current user. This is the userid whose identity will be assumed after authentica- tion. NOTE: This is only used with SASL mechanisms that allow proxying (e.g. PLAIN, DIGEST-MD5). -k num Minimum protection layer required. -l num Maximum protection layer to use (0=none; 1=integrity; etc). For example if you are using the KERBEROS_V4 authentication mechanism specifying 0 will force pop3test to not use any layer and specifying 1 will force it to use the integrity layer. By default the maximum supported protection layer will be used. -r realm Specify the realm to use. Certain authentication mechanisms (e.g. DIGEST-MD5) may require one to specify the realm. -f file Pipe file into connection after authentication. -n num Number of authentication attempts; default = 1. The client will attempt to do SSL/TLS session reuse and/or fast reauth (e.g. DIGEST-MD5), if possible. -s Enable POP3 over SSL (pop3s). -c Enable challenge prompt callbacks. This will cause the OTP mechanism to ask for the the one-time password instead of the secret pass-phrase (library generates the correct response). -i Don't send an initial client response for SASL mechanisms, even if the protocol supports it. -o option=value Set the SASL option to value. -v Verbose. Print out more information than usual.
SEE ALSO
pop3d(8)
CMU
Project Cyrus POP3TEST(1)