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Electronic communication using one of the accepted protocols.
Industry: Software
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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.
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 using email clients, ...