Código en el Email
<!-- MAIN VARIABLES DO NOT CHANGE START -->
<div style="font-size: 0em;">
%%[
/* Setting global variables */
SET @subscriberkey = _subscriberkey
SET @EmailName = emailname_
SET @EmailAttributesDE = 'EmailAttributes'
/* Setting Attributes for Email */
SET @Rows = lookuprows(@EmailAttributesDE,"EmailName", @EmailName)
SET @RowCount = rowcount(@Rows)
/* Loop for Attributes START */
IF @RowCount > 0 THEN
FOR @i = 1 TO @RowCount DO
SET @Row = row(@Rows, @i)
SET @Subject1 = field(@Row, 'Subject1')
SET @Preheader1 = field(@Row, 'Preheader1')
SET @Subject2 = field(@Row, 'Subject2')
SET @Preheader2 = field(@Row, 'Preheader2')
SET @Subject3 = field(@Row, 'Subject3')
SET @Preheader3 = field(@Row, 'Preheader3')
SET @UTMSource = field(@Row, 'UTMSource')
SET @UTMMedium = field(@Row, 'UTMMedium')
SET @UTMCampaign = field(@Row, 'UTMCampaign')
SET @UTMTerm = field(@Row, 'UTMTerm')
SET @UTMID = field(@Row, 'UTMID')
SET @UTM_Parameters = CONCAT('utm_source=',@UTMSource,'&utm_medium=',@UTMMedium,'&utm_campaign=',@UTMCampaign, '&utm_term=', @UTMTerm)
NEXT
ENDIF
/* Loop for Attributes END */
/* Checking if Is Test */
IF @IsTest == True THEN
SET @Subject = CONCAT('[TEST]: ', @Subject1)
SET @Preheader = @Preheader1
ELSE
/* If it is not test, we check the SL & PH availability */
IF EMPTY(@Subject2) THEN
SET @TotalSubjects = 1
ELSEIF EMPTY(@Subject3) THEN
SET @TotalSubjects = 2
ELSE
SET @TotalSubjects = 3
ENDIF
/* Randomize Subjects and Preheaders if many */
SET @Random = random(1,@TotalSubjects)
IF @Random == 1 THEN
SET @Subject = @Subject1
SET @Preheader = @Preheader1
ELSEIF @Random == 2 THEN
SET @Subject = @Subject2
SET @Preheader = @Preheader2
ELSE
SET @Subject = @Subject3
SET @Preheader = @Preheader3
ENDIF /* Random IF END */
ENDIF /* IsTest IF End */
]%%
</div>
<!-- AMPSCRIPT MAIN VARIABLES DO NOT CHANGE END -->Variable para Web Analytics Connector
%%=v(@UTM_Parameters)=%%