What happens if I personalize my email and the field that I used is empty?

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In case, if the field is not mapped in the contact list it will insert the fallback value. Suppose you want to personalize your email with the first name the personalization code will be {first_name, fallback=customer}. If the first name is not mapped within the contact list, then the system will insert the fallback value. You can edit the fallback value as per your requirement and the same is applied to all other contact fields too.