Proof multiple template variants in SFMC
When working with dynamic email templates that can generate multiple unique variants of the email, you are most probably tasked to proof all the variants to your stakeholder for review.
Create data extension
When proofing email templates, traditionally, we select subscribers from production or testing data extensions used in the actual send. This process involves proofing each template individually, changing the subject line for distinction based on language, country, or other segmenting fields altering the email copy.
Here’s a more efficient approach:
Firstly, set up a testable, sendable data extension to store proofing records. Create a CSV file with the required column names, and add data; typically, it mirrors the structure of the data extension used as the target population for the email campaign in which the template is utilized.

A good practice is to store these testable data extensions in a defined folder, simplifying proofing and ensuring centralization for easy access by any future campaign manager.
Sending proofs in one batch streamlines the process, removing the burden of searching for correct records in production or UAT data extensions suitable for a specific delivery template variant.
Add personalization AMPScript
%%[ IF _IsTestSend THEN SET @sl = Concat( Uppercase(@Country), " ", Uppercase(@Language), " ", Uppercase(@Segment), " ", Uppercase(@Audience), " ", "]:", @subjectline) ENDIF ]%%
This AMPscript snippet is used in the context of an email send and is checking if the email is a test send (_IsTestSend
is a system variable or rather called personalization string by salesforce, that is true
if the send is a test).
If the condition is true (meaning it’s a test send), the AMPscript sets a variable @subjectline
using the Concat
function. This variable is a concatenation of various values, including:
Uppercase(@Country)
: The uppercase version of the@Country
variable.Uppercase(@Language)
: The uppercase version of the@Language
variable.Uppercase(@Segment)
: The uppercase version of the@Segment
variable.Uppercase(@Audience)
: The uppercase version of the@Audience
variable.- “]:”: A string that separates the concatenated values.
@subjectline
: The value of the@subjectline
variable.
So, it’s essentially creating a string that combines these variables and strings, and the resulting string is assigned to the @subjectline
variable. This kind of dynamic subject line modification is often used in test sends for easier identification and tracking during testing phases.
Variable @subjectline contains templates subject line set dynamically depending on the segment or language. Subject line is displayed by following snippet set to email template properties.
%%=v(@subjectline)=%%
Proofing the template
Now, let’s proceed to proof our multivariant template. Open the template and go to the Preview and Test section.
In the Test send tab, choose Test data extensions and select the data extension created for this email template in the previous step.

Set the subject prefix to the email template name or a descriptor understandable to your stakeholders. Our AMPScript will dynamically incorporate segment codes and language during the send process.

If you use Adobe Campaign or are just curious, you can read the same article for guidance on proofing multiple variants of an email template and add variant to subject line of such proof email.