N.J. Stat. § 19:63-5
In the case of any election, the application for a mail-in ballot shall be made to the county clerk. The county clerk shall stamp thereon the date on which the application was received in the clerk's office.
In the case of applications for overseas federal election voter ballots, as provided for in P.L. 1976, c.23 (C.19:59-1 et seq.), no application shall be refused on the grounds that it was submitted too early.
In the case of voter registration forms that include a selected vote by mail option, a copy of each such form shall be transmitted to and received by the appropriate county clerk, who shall be responsible for providing mail-in ballots to each qualified voter requesting such ballots for future elections, until the voter requests otherwise in writing, or beginning with the 2020 general election cycle, if the voter does not vote by mail in four consecutive years, then the voter shall no longer be furnished with a mail-in ballot for future elections and the voter shall be notified in writing of the change.
N.J.S. § 19:63-5