n. - junk email, unsolicited and unwanted emails, normally advertising goods
n. - to unsubscribe to something; also v.
n. - a set of personal data, automatically appended at the bottom of an email, normally include the name, job title and telephone of the sender of the email
n. - an email programme that responds automatically to emails
n. - a letter sent by a company to a potential customer outlining the product or service being sold