You can now substitute a default value (a fallback value) to fall back on when using personalization fields like FirstName and LastName. The default value will be used when a FirstName or LastName doesn’t exist. Use the following format:
For example, if you’re addressing the top of your email message with the recipient’s first name, you could use:
If a first name is present, it will be used; otherwise the email would say “Dear Friend” or “Hey there”.