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The check on the email ID only applies to emails in engagement program streams.
In one batch smart campaign, Marketo also performs a deduplication based on the email address, to make sure the same email is not sent the email twice by the same batch occurence of the smart campaign.
But if the SC is scheduled multiples times and the lead qualifies multiple times, or if it's a trigger SC and the lead qualifies more than once, or else of you use the same email in 2 smart campaign, you will have to use a choice with a "was sent email" or "not was sent email" filter to control the same email is not sent twice.
Thank you very much for those tips, it's really helpful.
The fact, I'm using a trigger SC, it might be better to use a "was sent email" filter or a "Member of the SC [not in]" #1 in the second SC's Smart List to be sure to not sending twice the same email to the qualified leads.
Have a great day !