Auto-response back into your Outlook that the sender number is incorrect

If you are sending the message to country that you have your account with, we don't have automate country dail code for that other country you have enter, simply we don't know where are you sending the message to. 

Therefore for sending message to other country that you have registered your account with, enter the (+) plus sign and follow by the targeted country dailing code;

Example for targeted UK distination: +44 7599234234