Issue
A lead skips the send email flow step, but processes through the other flow steps. In the results tab and in the lead activity log there is no mention of the email step.
Example:
Solution
If your lead record is blocked from receiving emails, Marketo will not send an email to that lead. If an email is not sent, there will not be a record in the activity log for the lead record or in the results tab of the smart campaign, but the lead will still go through the other steps as normal.