Does the Mandrill dynamic template support collection iteration?
Note. This answer is outdated, this feature was added shortly after I wrote this post.
This is not possible (see the note at the end of this page ). Their recommended solution is to use multiple mc: edit sections or variables (one per item) in the Mandrill template.
Since this cannot be done for unknown collection sizes, I decided to preprocess multiple parts of the email (e.g. header, body, footer) using a more powerful templating language (mustache in my case). I am only submitting these preprocessed parts to Mandrill via the API.
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