I checked my where's my refund, it says alert and I will receive something in the mail, what next

I would wait until you receive the letter. The Irs will explain if your Return has been Delayed or Intercepted.

• Read your notice carefully—it explains the information we received and how it affects your tax return.
• Complete the notice response form whether or not you agree or disagree with the notice, the response form explains what actions to take. (Your specific notice may not have a response form. In that case, the notice will have instructions on what to do).
• Contact the business or person reporting the information, if it is wrong. Ask them to correct it, and then provide the corrected information to us.