Electronic junk mail.
Sources:
CNSSI 4009-2022
from
IETF RFC 4949 Ver 2
NIST SP 800-12 Rev. 1
under Spam
from
CNSSI 4009
NISTIR 7621 Rev. 1
under Spam
from
CNSSI 4009-2022
Unsolicited bulk commercial email messages.
Sources:
NIST SP 800-45 Version 2
under Spam
The abuse of electronic messaging systems to indiscriminately send unsolicited bulk messages.
Sources:
NIST SP 800-53 Rev. 5