When Marketing Suspended is checked in a lead's record, it will prevent any email from being sent by Marketo including the emails sent from Marketo Sales Insight.
Outlook emails however, are not sent via Marketo. They are sent by the mailserver to which the client is connected; ie Goolge mail servers or Microsoft Exchange Servers, and are not under Marketo's control.
The Marketing Suspended check box is located on the Lead Info tab.
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