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Theoretical Activation Points Receiving email Do a SMTP dialog with the peer, receiving email from it, usually storing the emails in a queue and maybe sending on later Stored email in queue Operate on an email that has been received earlier. There is no current SMTP dialog going on Sending email Do a SMTP dialog with a peer, send email to it. Proxy (receive and forward) Having two SMTP dialogs at the same time. Mostly forwarding commands and replies; often no own email queue R yes R yes T no T no |