Section 3.18 - Use and disclosure of mailing addresses(a) When attempting to locate a debtor in order to collect or compromise a debt under this part or 31 CFR parts 902 through 904 or other authority, agencies may send a request to Treasury to obtain a debtor's mailing address from the records of the Internal Revenue Service (IRS).(b) Agencies are authorized to use mailing addresses obtained under paragraph (a) of this section to enforce collection of a delinquent debt and may disclose such mailing addresses to other agencies and to collection agencies for collection purposes.