-A name
       Executes an account command (see below) for name after the startup files have been read.

-a file
       Attach the given file to the message.

-B     Make standard input and standard output line-buffered.

-b address
       Send blind carbon copies to list.  List should be a comma-separated list of names.

-c address
       Send carbon copies to list of users.

-D     Start in disconnected mode; see the description for the disconnected variable option.

-d     Enables  debugging  messages and disables the actual delivery of messages.  Unlike -v, this option
       is intended for mailx development only.

-e     Just check if mail is present in the system mailbox.  If yes, return an exit status of zero, else,
       a non-zero value.

-E     If an outgoing message does not contain any text in its first or only message part, do not send it
       but discard it silently, effectively setting the skipemptybody variable at program startup.   This
       is useful for sending messages from scripts started by cron(8).

-f [file]
       Read  in  the  contents  of  the user's mbox (or the specified file) for processing; when mailx is
       quit, it writes undeleted messages back to this file.  The string file is handled as described for
       the folder command below.

-F     Save the message to send in a file named after the local part of the first recipient's address.

-H     Print header summaries for all messages and exit.

-h hops
       Invoke  sendmail  with  the  specified hop count.  This option has no effect when SMTP is used for
       sending mail.

-i     Ignore tty interrupt signals.  This is particularly useful when using mailx on noisy phone lines.

-I     Shows the `Newsgroup:' or  `Article-Id:'  fields  in  the  header  summary.   Only  applicable  in
       combination with -f.

-n     Inhibits  reading  /etc/nail.rc  upon  startup.  This option should be activated for mailx scripts
       that are invoked on more than one machine, because the contents of that file  may  differ  between
       them.

-N     Inhibits the initial display of message headers when reading mail or editing a mail folder.

-q file
       Start the message with the contents of the specified file.  May be given in send mode only.

-r address
       Sets  the  From  address.  Overrides  any from variable specified in environment or startup files.
       Tilde escapes are disabled.  The -r address options are passed to the mail transfer  agent  unless
       SMTP  is  used.   This  option  exists  for  compatibility only; it is recommended to set the from
       variable directly instead.

-R     Opens any folders read-only.

-s subject
       Specify subject on command line (only the first argument after the -s flag is used as  a  subject;
       be careful to quote subjects containing spaces).

-S variable[=value]
       Sets the internal option variable and, in case of a string option, assigns value to it.

-T name
       Writes  the  `Message-Id:'  and `Article-Id:' header fields of each message read in the file name.
       Implies -I.  Compressed files are handled as described for the folder command below.

-t     The message to be sent is expected to contain a message header with `To:', `Cc:', or `Bcc:' fields
       giving its recipients.  Recipients specified on the command line are ignored.

-u user
       Reads the mailbox of the given user name.

-v     Verbose mode.  The details of delivery are displayed on the user's terminal.

-V     Print mailx's version and exit.