You should avoid sending recipients multiple, repetitive subscription invitation and confirmation messages. You should verify how many of these messages were previously sent before you send another message.
To view all subscription messages sent to a recipient:
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Open the recipient’s record.
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Click the Marketing subtab.
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The Subscription Message History subtab contains a list of all subscription invitation and confirmation email messages previously sent to the recipient. The list is organized by date and time and contains information about the sender, the recipient, and the type of message.