Overides the from_email wrongly

I’ve installed wpmandril 1.33 on wp 4.1

I used to send using [email protected] directly through server before.

I’ve set the sender email on wpmandrill as [email protected].
I can send emails using mandrill app.
However,
I keep receiving an error while testing the wpmandrill plugin.

Error:
Test failed. Please verify the following:
1. That your web server has either cURL installed or is able to use fsock*() functions (if you don’t know what this means, you may want to check with your hosting provider for more details);
2. That your API key is active (this can be viewed on the SMTP & API Credentials page in your Mandrill account);

However above error message on wpmandrill is not correct. I can verify both 1 & 2 are invalid, the environment allows fsock, curl and api key is correct.

Further dig into the problem on API LOG.
There I found the problem.
even though I set the from_email as [email protected] on wpmandrill settings, it is somehow overridden to “Message from MY COMPANY NAME [email protected]”

Thus it throws an exception due to the invalid from_email.

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