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

If you use .NET SmtpClient, may be this is because of bug on it: https://social.msdn.microsoft.com/Forums/vstudio/en-US/4d1c1752-70ba-420a-9510-8fb4aa6da046/subject-encoding-on-smtpclientmailmessage

Workaround, that helped us:

use

message.SubjectEncoding = Encoding.Unicode;

instead of

message.SubjectEncoding = Encoding.UTF8;

This is still actual in .Net Framework 4.7.2