Indiana Code Title 3. Elections § 3-7-33-4

Sec. 4. (a) This section applies to a voter registration application submitted on a registration by mail form under IC 3-7-22.

(b) Except as provided in subsection (c), and as provided in 52 U.S.C. 20507(a)(1), an eligible applicant whose application is postmarked not later than twenty-nine (29) days before the election shall be registered to vote in the election.

(c) If a postmark on a registration by mail form is missing or illegible, an eligible applicant shall be registered to vote in the election if the form is received by the county voter registration office not later than the Monday following the close of the registration period before the election.