Exhibit

We hereby consent to the incorporation by reference in the Registration Statement on Form S‑8 (No.333-180839, No.333-187321, No.333-194599, No.333-202312, No.333-209712, No.333-214366, No.333-216195 and No.333-221870) of Proofpoint, Inc. of our report dated February 23, 2018 relating to the consolidated financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.