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Welcome message:
Automatically Sent Message to new list members as soon as Are Their email addresses added successfully.

Whitelist or whitelisting:
Opposite of blacklisting. Lists of sites built with good Have Which ISP Relationships, and allow emails from. Advance-authorized list of email addresses, held by an ISP, subscriber or Other email service provider, email messages from Whom Are Delivered Regardless of spam filters.

Worm:
A piece of malicious code, Often Delivered via an executable attachment in email or over a computer network.