This discussion clarifies that serving a legal notice under Section 138 of the NI Act by hand is a valid method of service, even if the judge disagrees. Several High Court and Supreme Court judgments, including Central Decision Board v. S.V. Dasan and Silas Deatson v. State of Kerala, support this. While registered post is common, the law only requires notice in writing. Proof of delivery, such as an acknowledgment or affidavit, is crucial to overcome potential disputes about the accused's receipt of the notice.