So You Got A Letter From The Internal Revenue Service Part Two By: Mallory Megan | - In part one in this four part series of articles on mail correspondence with the IRS, I informed you that there are three types of mail correspondence that the Internal Revenue Service may mail out to you: "correspondence audits" which are audits by mail, "CP-2000" letters, which let taxpayers know that they left a bit of income off of their returns, and "math error notices."
