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NAME

       smtptest - interactive SMTP test program

SYNOPSIS

       smtptest [ -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

       smtptest  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.

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 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 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 SMTP over SSL (smtps).

       -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

       sendmail(8)