One area to highlight where internet standards can be easily violated is when purchasing mailing lists. Often, recipients on these lists do not want to receive Unsolicited Commercial Email (UCE) and the lists can even contain Spam trap email addresses. Salesforce monitors mailing practices to ensure we can obtain the highest deliverability of mail for our customers.
See Also:
Send Mass Email in Salesforce Classic
Change default 'From' email address when you send a single email or mass email
Considerations for Sending Mass Email in Salesforce Classic
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