Worked on the vlang/v repository to enhance SMTP envelope parsing by ensuring that MAIL FROM and RCPT TO commands only accept bare mailbox addresses, stripping any display names to align with RFC 5321 and 5322 standards. The implementation focused on robust string parsing in V, carefully preserving quoted local-parts and handling angle-addr wrappers without corrupting legitimate addresses. Comprehensive unit and end-to-end tests were added to validate edge cases, including quoted and malformed inputs, increasing regression coverage. This backend development improved SMTP server compatibility and reduced envelope-level errors, directly contributing to more reliable outbound mail processing and clearer protocol conformance.