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Hi Colby, Unsubscribed Leads is a system smart list that is based on the qualification "Unsubscribed" is true. When Unsubscribed is true, Marketo will not email someone.
The benefit of adding the filter to the campaign is that they won't go into your calculated number as "blocked from mailing" as shown below. When there is a value other than 0 there, you will want to subtract that number from the "set to affect" number to get an accurate count of how many people this email will be sent to.
MKTO knows not to send to unsubscribed leads. But that being said, I have a smart list (that includes unsubscribes, invalids, suspended, competitors, etc) and alway include that suppression list in email sends just to be on the super safe side!
If you don't add the filter in your smart list for "Not in" Unsubscribed leads, the email will still not send to those unsubscribed leads. When you schedule your campaign it will show you the # of people who are blocked from receiving the email campaign if they are marked unsubscribed, marketing suspend and if email invalid is true.
It depends on the purpose of the campaign smart list. From a list cleanliness/reproting perspective, you probably should. From a functionality perspective, it doesn't need to be (ex. will unsubscribes be messaged? no).
When you create a campaign smart list leads that are excluded from the recieving a mailing will be noted on the schedule tab. You will see language to the effect of "Around XX leads are blocked from mailings" right below the Smart List Status that indicates who will be affected. The unsubscribed folks (or marketing suspended, blacklisted, etc) will never be mailed.
You are both right depending on the purpose of the campaign and your internal process. Rest assured that unsolicited mail will not be sent though. They are automatically excluded whether you include the filter or not.