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Mail clients save a copy of each sent message to the Sent folder with an IMAP APPEND. The bridge did not implement APPEND, so Thunderbird reported "a copy was not placed in your Sent folder" after every send. Tuta saves sent mail server-side and the syncer brings that copy back, so an APPEND to Sent is a no-op: read and discard the literal, reply OK, which avoids creating a duplicate. APPEND to any other folder is rejected before the literal is sent (the client then aborts the synchronizing literal and the stream stays in sync); real APPEND-to-Drafts is left for a follow-up. The literal is read at the socket level since the session layer is line based. Tested: parse_append, the Sent-folder decision, and the full handle_append flow over an in-memory pipe (Sent reads the literal and returns OK, a non-Sent folder is rejected with no continuation).