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open relay

Software; Email

An SMTP email server that allows outsiders to relay email messages that are neither for nor from local users. Often exploited by spammers and hackers.

opt-in

Software; Email

A specific, pro-active, request by an individual email recipient to have their own email address placed on a specific mailing list. Many list renters and buyers now require list ...

opt-out

Software; Email

A specific request to remove an email address from a specific list, or from all lists operated by a single owner. Also, the process of adding an email addresses to lists without ...

pass-along

Software; Email

An email recipient who got your message via forwarding from a subscriber. (Some emails offer "forward to a friend" in the creative, but the vast majority of pass-alongs happen ...

permission

Software; Email

The implicit approval given when a person actively requests to have their own email address added to a list.

personalization

Software; Email

A targeting method in which an email message appears to have been created only for a single recipient. Personalization techniques include adding the recipient's name in the ...

phishing

Software; Email

A form of identity theft in which a scammer uses an authentic-looking email to trick recipients into giving out sensitive personal information, such as credit-card or bank account ...