Perbaiki Tanggal Migrasi imapsync di Gmail

imapsync is frequently used to migrate kotak surat 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, terutama when the message goes through Gmail's spam and security filters.

Gmail's IMAP behavior is notably different from standard server IMAPs. Gmail adds its own header Received (biasanya containing "gmailapi.google.com" or the IMAP gateway identifier) with the stempel waktu unggah. 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 stempel waktu unggah, creating an unpredictable mix of correct and intanggal yang benars within the same migrated kotak surat.

For Gmail web pengguna, the display date is derived from the header Date, which masks the INTERNALDATE issue. But pengguna who connect to their Gmail account via Outlook, Apple Mail, or Thunderbird see the tanggal migrasi on affected messages. The inconsistency between Gmail web and klien IMAPs 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 antarmuka web but fully visible in klien IMAPs. 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 tanggal migrasi on affected emails. This inconsistency leads to conflicting pengguna reports that complicate support efforts.

Gmail's IMAP pencarian (SEARCH SINCE/BEFORE commands) uses the INTERNALDATE, so klien IMAPs that perform server-side date pencarianes return incorrect results. Third-party alat cadangans that connect to Gmail via IMAP archive the tanggal yang salahs, creating permanent inaccuracies in backup records. Google Vault and Workspace kepatuhan tools may also reference the INTERNALDATE for berbasis tanggal holds, potentially impacting legal and regulatory workflows.