Options are controlled via the sssseeeetttt and uuuunnnnsssseeeetttt commands. Options may be
either binary, in which case it is only significant to see whether they
are set or not, or string, in which case the actual value is of interest.
The binary options include the following:
RRRReeeeppppllllyyyyaaaallllllll Swaps the behavior of the rrrr////RRRReeeeppppllllyyyy////RRRReeeessssppppoooonnnndddd and rrrraaaa////RRRReeeeppppllllyyyyaaaallllllll
commands resulting in a more BSD-like interface.
aaaappppppppeeeennnndddd Causes messages saved in _m_b_o_x to be appended to the end
rather than prepended. (This is set in /usr/lib/Mail.rc
on version 7 systems.)
aaaasssskkkk Causes _M_a_i_l to prompt you for the subject of each message
you send. If you respond with simply a newline, no
subject field will be sent.
aaaasssskkkkcccccccc Causes you to be prompted for additional carbon copy
recipients at the end of each message. Responding with a
newline indicates your satisfaction with the current list.
aaaauuuuttttoooopppprrrriiiinnnntttt Causes the ddddeeeelllleeeetttteeee command to behave like ddddpppp - thus, after
deleting a message, the next one will be typed
automatically.
ccccrrrrtttt Causes your pager to be invoked if a message to be printed
is longer than the current window. This option can also
be used as a valued option (see below).
ddddooootttt The binary option _d_o_t causes _M_a_i_l to interpret a period
alone on a line as the terminator of a message you are
sending.
hhhhoooolllldddd This option is used to hold messages in the system mailbox
(instead of _m_b_o_x ) by default.
iiiiggggnnnnoooorrrreeee Causes interrupt signals from your terminal to be ignored
and echoed as @'s.
iiiiggggnnnnoooorrrreeeeeeeeooooffff An option related to _d_o_t is _i_g_n_o_r_e_e_o_f which makes _M_a_i_l
refuse to accept a control-D as the end of a message.
_I_g_n_o_r_e_e_o_f also applies to _M_a_i_l command mode.
kkkkeeeeeeeepppp Prevents _M_a_i_l from deleting empty mailboxes when you quit.
kkkkeeeeeeeeppppssssaaaavvvveeee If set, messages which are saved via the ssssaaaavvvveeee command are
_n_o_t deleted from the current mailbox automatically.
mmmmeeeettttoooooooo Usually, when a group is expanded that contains the
sender, the sender is removed from the expansion. Setting
this option causes the sender to be included in the group.