Piggyback
e-mail is a term used in the e-mail
marketing industry. A piggyback e-mail is comprised of a third-party
advertisement embedded in the body of a e-mail sent to an opt-in subscription
e-mail list that is comprised of demographics
of target consumers the third-party want to advertise to. In this instance,
the e-mail containing the advertisement comes from the list owner, not directly
from the advertiser.
See also solus e-mail.