If you need to import a number of email addresses into a mailing list,
adding them individually can take a long time. To automate this task you
can use Plesk command-line utilities. To add several email addresses to
the mailing list, run the following command:
# /usr/local/psa/bin/maillist.sh --update <mailing list> -members add:<e‑mail 1>[,<e‑mail 2>,...,<e‑mail N>]