Mandrill “reject_reason”: “invalid-sender”

Question

I\'m trying to send emails using mandrill email service but I get the following error

    Full Response
[
    {
        \"email\": \"someemail@somedomain.co         


        

Answer 1

For me, it was because my emails were coming from email@example.net1 Mandrill rejected me because of the 1 at the end. e+mail@example.net and email@example.neta are both valid and will be accepted.

My other tests just had blank From headers, so they were rejected as well. I didn't even realize these emails were being received by Mandrill until I logged in and checked the API logs.