smtptest - interactive SMTP test program
[ -t keyfile
] [ -p port
[ -a userid
] [ -u userid
] [ -k num
] [ -l num
[ -r realm
] [ -f file
] [ -n num
] [ -c
] [ -o option=value
] [ -v
is a utility that allows you to authenticate to a SMTP server
and interactively issue commands to it. Once authenticated you may issue any
SMTP 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 smtp server. Also those
developing SMTP clients find it useful.
- -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
smtp as defined in /etc/services.
- -m mechanism
- Force smtptest to use mechanism for authentication.
If not specified the strongest authentication mechanism supported by the
server is chosen.
- -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
authentication. 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 smtptest 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
- -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.
- Enable SMTP over SSL (smtps).
- 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).
- 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.
- Verbose. Print out more information than usual.