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

I've had a similar problem recently. It was due to my use of certain characters in the message.from_name field. After searching through documentation and stack overflow, I couldn't find a list of forbidden characters, so although this doesn't necessarily pertain to your case, I thought I'd share this small list I compiled of some acceptable characters (not an exhaustive list):

• a-z
• A-Z
• 0-9
• _, -, !, #, $, %, \, ^, &, *, +, =, {, }, ?, .

In JS, here's a RegExp that will match with forbidden characters (or, rather, any characters that aren't in the aforementioned list):

const pattern = /[^a-zA-Z0-9_\-!#$%\^&*+={}?.]/;

Hope this is helpful for anyone else stuck on this.