You can edit an email job after it has been sent and change the Schedule parameters.

To do this access the Email Jobs menu
Filter the email jobs grid to show the job you wish to edit
Click the blue edit arrow to edit the job
Click the Schedule tab
Click the drop down button on the "Send a follow-up email on" field and click the Clear button
Ensure that the "Send additional follow-up emails every" field is empty
Click the Update button

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