That's a complicated question to answer. Here's the basic
idea: A list of subscribers' email addresses is stored on the
server. Each subscriber has a list of Flags associated with his
email address that determines how the mailing list software
delivers the messages to him. An incoming message is
checked by certain list parameters, where it is perhaps
refused (depending on how the moderator has configured the
list), and then sent to every member in the list of subscribers.
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