Emails get marked as spam when they are sent without the recipient's consent. The consent can be set via email opt-ins.
Which opt-in types allow you to send email campaigns Vtiger does not deliver emails to contacts with opt-in set to ‘None’, ‘Opted out (user)’, or ‘Opted out (contact)’. Email campaigns are delivered only to contacts with opt-in set to:
- Single opt-in (user)
- Single opt-in (webform)
- Double opt-in
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