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Description
Based on a discussion from the Stalwart GitHub issue https://github.com/stalwartlabs/mail-server/discussions/477, it appears that Stalwart's IMAP server only indexes standard headers defined in RFCs and does not support searching custom headers (such as
X-Auto-Bcc
) by default. This design choice is intended to optimize server performance by maintaining a manageable index size, as most users typically search by common fields like recipients, subjects, or message contents.Key Points
X-Auto-Bcc
) because these headers are not indexed.A
server_supports_custom_headers
function is implemented to determine if the server supports searching custom headers. This function sends a test command to the server and inspects the response to check for support.Related Issue: https://github.com/cypht-org/cypht/issues/1149