There are currently two options for e-mail list services at NASA Headquarters:

Mailman E-mail List Service

Mailman is a mailing list management application which allows list owners to manage their lists directly through the use of a Web interface.  It supports a wide range of types of mailing lists, such as general discussion lists and announcement-only lists and has extensive privacy control features.  The Mailman list service superceded Majordomo at Headquarters effective January 31, 2008. Unlike NOMAD distribution lists, Mailman lists accommodate external addresses (i.e., are not restricted to ‘nasa.gov’ addresses) and can accommodate an unlimited number of recipients.
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NOMAD Global Distribution List

A NOMAD Global Distribution List (DL) is a list of contacts which provides an easy way to send messages to a group of people within the NOMAD Global Address List (GAL). A message sent to a DL goes to all recipients listed in the DL.  Distribution Lists can be used in messages, task requests, meeting requests, and other distribution lists. There are two restrictions on Global Distribution Lists. 1) A Global DL can only contain NASA internal contacts (i.e., all recipients must be visible in the GAL); 2) There is a limit of 100 recipients per list.
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