In Salesforce, a merge field is a placeholder (for example, {!Object__c.Field__c}) that pulls data from a record directly into an email template. When an HTML email template is sent, a merge field may display as blank even when the corresponding record field is populated. This occurs when the merge field code in the template contains hidden HTML formatting tags that corrupt the merge field syntax.
You can verify this by highlighting the merge field in the email template preview, right-clicking the selection, and choosing View Source, View Page Source, or Inspect Element. For example, the merge field code in the template appears as {!Object__c.Field__c} but when viewing the HTML source, the actual code is {!Object__c.Field__c</font><font size="2">} — the hidden HTML tags break the merge field.
See Also:
Email template does not merge the fields from a related list.
Cross-object merge fields do not work in email templates.
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