Another way to do this particular task is to echo the "Scheduled Maintenance" form post data to an outside database using a webhook. Preferably that database is itself a calendaring app, so it gives you a nice visual for all the entered events. Then run a daily batch so all the leads on the account (really an "account-like" group of leads with the same Company Name or Email domain) get a notification. In essence, you are subscribing your database to the calendar feed. However, I'm a little uneasy about a generic Marketo form giving the go-ahead for an account-wide mass email. How you do stop someone from using that form for malicious purposes? Signifying a maintenance period should be done via a secure form. If you use a calendaring app, only a logged-in user would be able to create events.
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