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I recently discovered a really nice way to create my Email campaign templates.
The company is called Klaviyo
They have a very simple to use Drag n Drop interface and I have used it for the past several of my newsletters.
They let you export the email as HTML which I can then drop into Sendy and add the custom unsubscribe links, webversion, etc. to the email.
it is great! Free to setup an account and create unlimited templates, etc.