Certified or registered mail.

Del. Code tit. 29, § 602
in effect
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The State, its various offices, departments and agencies may use certified mail in all cases where registered mail was required prior to September 30, 1959.
Source: DE Code (Official Site)URL: https://delcode.delaware.gov/title29/c006/index.htmlFetched: 10/4/2026
Del. Code tit. 29, § 602 — Certified or registered mail | Delaware Code | Corpus