Send With SES does not have an inbuilt HTML editor to compose your custom HTML emails. However this shouldn't prevent you from using your your custom HTML. Here's how you can do it ...
1.Create a blank template with just one 'replace tag' {{custom_html}} like below ...
2. Compose your custom HTML using any HTML editor.
3. Replace {{custom_html}} in above template with your custom HTML when triggering an email via the API.
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