imapc storage ============= The imapc storage accesses a remote IMAP server as if it were a regular Dovecot mailbox format. Dovecot can treat it as a very dummy storage or optionally a more capable storage. ---%<------------------------------------------------------------------------- # In-memory index files: mail_location = imapc: # Store index files locally: mail_location = imapc:~/imapc ---%<------------------------------------------------------------------------- Connection settings ------------------- Do a regular IMAP LOGIN to imap.example.com using 'a LOGIN user@example.com secret': ---%<------------------------------------------------------------------------- imapc_host = imap.example.com imapc_password = secret imapc_port = 143 imapc_user = user@example.com ---%<------------------------------------------------------------------------- If you want to use a master user login, set: ---%<------------------------------------------------------------------------- imapc_master_user = masteruser ---%<------------------------------------------------------------------------- For SSL, use either: * ---%<---------------------------------------------------------------------- imapc_ssl = imaps imapc_port = 993 ---%<---------------------------------------------------------------------- * ---%<---------------------------------------------------------------------- imapc_ssl = starttls imapc_port = 143 ---%<---------------------------------------------------------------------- For testing you may want to disable all SSL certificate checks: ---%<------------------------------------------------------------------------- imapc_ssl_verify = yes ---%<------------------------------------------------------------------------- You can use other SASL mechanisms besides PLAIN by specifying (the first one advertised by IMAP server is used): ---%<------------------------------------------------------------------------- imapc_sasl_mechanisms = external plain login ---%<------------------------------------------------------------------------- The SASL client mechanisms are implemented in Dovecot's lib-sasl/ code. It's possible to add more with plugins. Other settings -------------- imapc_cmd_timeout: How long to wait for an IMAP command to reply before disconnecting and retrying (default: 5 mins). imapc_list_prefix: Access only mailboxes under this prefix. For example 'imapc_list_prefix=INBOX/' imapc_max_idle_time: Send something (NOOP/DONE) to server after not sending anything for this amount of time (default: 29 mins). imapc_rawlog_dir: Log all IMAP traffic input/output to this directory. Features and workarounds ------------------------ 'imapc_features' setting is a space-separated list of features and workarounds that can be enabled. Optimizations ------------- rfc822.size: Allow passing through message sizes using 'FETCH RFC822.SIZE' fetch-headers: Allow fetching specific message headers using 'FETCH BODY.PEEK[HEADER.FIELDS (..)]' search: Allow using 'SEARCH' command. Features -------- gmail-migration: Enable GMail-specific migration: Use IMAP X-GM-MSGID as POP3 UIDL. Add $GMailHaveLabels keyword to mails that have X-GM-LABELS except for \Muted (to be used for migrating only archived emails in "All Mails"). Add pop3_deleted_flag to mails that don't exist in POP3 server. proxyauth: Use Sun/Oracle IMAP-server specific PROXYAUTH command to do master user authentication. Normally this would be done using the SASL PLAIN authentication. throttle:INIT:MAX:SHRINK: When receiving [THROTTLED] response (from GMail), throttling is applied. INIT = initial throttling msecs (default: 50 ms), afterwards each subsequent [THROTTLED] doubles the throttling until MAX is reached (default: 16000 ms). When [THROTTLED] is not received for a while, it's shrank again. The initial shrinking is done after SHRINK (default: 500 ms). If [THROTTLED] is received again within this timeout, it's doubled, otherwise both throttling and the next shrinking timeout is shrank to 3/4. Workarounds ----------- zimbra-workarounds: Fetch full message using 'BODY.PEEK[HEADER] BODY.PEEK[TEXT]' instead of just 'BODY.PEEK[]' because the header differs between these two when there are illegal control chars or 8bit chars. This mainly caused problems with dsync, but as of v2.2.22+ this should no longer be a problem and there's probably no need to enable this workaround. no-examine: Use SELECT instead of EXAMINE even when we don't want to modify anything in the mailbox. This is a Courier-workaround where it didn't permanently assign UIDVALIDITY to an EXAMINEd mailbox, but assigned it for SELECTed mailbox. fetch-msn-workarounds: Try to ignore wrong message sequence numbers in FETCH replies whenever possible, preferring to use the returned UID number instead. fetch-fix-broken-mails: If a FETCH returns 'NO' (but not 'NO [LIMIT]' or 'NO [SERVERBUG]'), assume the mail is broken in server and just treat it as if it were an empty email. NOTE: This is often a dangerous option! It's not safe to assume that NO means a permanent error rather than a temporary error. This feature should be enabled only for specific users who have been determined to be broken. (This file was created from the wiki on 2017-05-11 04:42)
