If you want, other users can use aliases which you establish.
    This is particularly useful when you want to set up a mailing
    list which you want other people to post messages to. (See the
    Mailing lists topic for details on settingup a mailing list.) You
    allow other people to use specific aliases of yours by declaring
    those aliases to be public. This is done with the "attributes"
    parameter of the "set" command described in Set.

    For example, let us assume that the user sue@example.com has
    already created an alias named PIZZA-ORDER. Then, to declare
    PIZZA-ORDER to be a public alias, Sue would use the command

    db> set pizza-order public

    Other users can then use this alias by sending mail to sue+pizza-
    order@example.com.