Use conditional merge fields in your acknowledgement email. Conditional fields do not appear in the final email if they do not apply to the transaction being acknowledged.
For example, for a donation acknowledgement, you can enter 'We greatly appreciate <Company Name> support.' If the donation is not from a company, this sentence does not appear in the final acknowledgement. To identify conditional fields, look for begin section and end section indicators. For example, <Corporate.Begin Section> and <Corporate.End Section> indicate that the sentence with <Company Name> is conditional.