After a few days and a few escalations, I've recieved an answer. The `mailfrom` object was apparent

After a few days and a few escalations, I've recieved an answer.

The mailfrom object was apparently an internal API that was not intended to be public. However, since it was documented, they told me how to use it.

- Do not set the top level from field. Do this inside the personalizations object instead.
- Set the mailfrom in the top level.

From then, it should work. Tested and it seems to be working.
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