189 email address can't send short messages. Why?

Your question is very general! There are many reasons why you can't send text messages. There are 300 free messages in 189 mailbox every month, and 50 messages in 100 external network and 200 internal network every day, all of which failed to be sent! Also, because I didn't get the verification code, I couldn't send it out. In my opinion, you should give it away for free!