To send mail to more than one user, use the SEND command, but at
    the To: prompt, type a list of names or the name of an existing
    distribution list.

    When you type a list of names, use the following guidelines:

    o  Separate the names with a comma ( , ).

    o  If multiple users are on the same remote host, type the full
       user_name@host combination for each user.

    o  If a user is on your local host, omit the at sign (@) and host
       name.

    For example:

    MAIL>  SEND
    To: user1,user2,user3@host3,user4@host4

    In the preceding example, user1 and user2 are located on the
    local OpenVMS system; user3 is located on host3; and user4 is
    located on host4.

    MAIL> SEND
    To: user1@host5,user2@host5

    In the preceding example, both user1 and user2 are located on
    remote host host5.

    To send mail to multiple users by entering the name of a
    distribution list, follow these guidelines:

    o  The file with the distribution list can be yours or belong to
       someone else.

    o  The file can reside locally or remotely.

    o  Do not include the names of other distribution lists in the
       distribution list.

    You can use two kinds of distribution lists: OpenVMS distribution
    lists and SMTP distribution lists.