A: Send an e-mail to majordomo@aracnet.com
with an empty header and the body
list goldtri-digest
to get a list of all available digests, and choose the filename of your missing digest.
Send an e-mail to majordomo@aracnet.com
with an empty header and the body
get goldtri-digest <fill_in_the_filename_of_your_missing_digest>
to receive the missing one, if it´s still available.