Gmail에서 imapsync 마이그레이션 날짜 수정

imapsync is frequently used to migrate 사서함 to Gmail and Google Workspace accounts via IMAP. When imapsync uploads messages to Gmail's IMAP interface, Gmail processes each message through its own mail pipeline. Even when the --syncinternaldates flag is specified, Gmail's IMAP implementation may override the requested INTERNALDATE in certain situations, 특히 when the message goes through Gmail's spam and security filters.

Gmail's IMAP behavior is notably different from standard IMAP servers. Gmail adds its own Received 헤더 (일반적으로 containing "gmailapi.google.com" or the IMAP gateway identifier) with the upload timestamp. Additionally, Gmail's handling of the APPEND command with a specified INTERNALDATE is not always consistent. Some messages receive the requested date, while others are stamped with the upload timestamp, creating an unpredictable mix of correct and in올바른 날짜s within the same migrated 사서함.

For Gmail web 사용자, the display date is derived from the Date 헤더, which masks the INTERNALDATE issue. But 사용자 who connect to their Gmail account via Outlook, Apple Mail, or Thunderbird see the 마이그레이션 날짜 on affected messages. The inconsistency between Gmail web and IMAP clients creates confusion, and the partial nature of the problem (some dates correct, some not) makes it even harder to diagnose and quantify the scope of affected messages.

Gmail's dual-date behavior means the problem is invisible in the Gmail 웹 인터페이스 but fully visible in IMAP clients. Users who only use Gmail in a browser may never notice the issue. Users who connect Outlook, Apple Mail, or Thunderbird to the same Gmail account see the 마이그레이션 날짜 on affected emails. This inconsistency leads to conflicting 사용자 reports that complicate support efforts.

Gmail's IMAP search (SEARCH SINCE/BEFORE commands) uses the INTERNALDATE, so IMAP clients that perform server-side date searches return incorrect results. Third-party 백업 tools that connect to Gmail via IMAP archive the 잘못된 날짜s, creating permanent inaccuracies in 백업 records. Google Vault and Workspace 규정 준수 tools may also reference the INTERNALDATE for date-based holds, potentially impacting legal and regulatory workflows.