What are whitelists?

Databases containing those email addresses, IPs or domains that a user considers trusted contacts. The main objective of an advertiser who practices email marketing , once a subscriber has been obtained, is to get him to incorporate his email address to the white list and thus legitimize his future shipments. If you do, the filters will no longer consider them potential spam and their contents will be automatically downloaded from the server, without the need for a new approval in the account blocking mechanisms.

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