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Title: mail-mta/postfix-3.11.0: Default database change Author: Eray Aslan <[email protected]> Posted: 2026-03-13 Revision: 1 News-Item-Format: 2.0 Display-If-Installed: mail-mta/postfix The default local database type in mail-mta/postfix has been hash for local files and btree for caches and both file types depend on sys-libs/db. However, BerkeleyDB has not been developed sufficiently in recent years and the licensing change in 2013 made using the latest versions of BerkeleyDB problematic. Consequently, we are stuck with using ancient versions of BerkeleyDB and there is a general tendency in the Linux ecosystem to sunset BerkeleyDB support. Postfix made switching database types easier with its latest release. We will be changing the default database type in postfix for both local databases and caches to lmdb starting with mail-mta/postfix-3.11.0. Timeline: mail-mta/postfix-3.11.0: March 2026. Both lmdb and berkdb USE flags are on by default. BerkeleyDB is still supported by default but the default database and cache type changes to lmdb. mail-mta/postfix-3.12.0: Expected Q1 2027. BerkeleyDB support will be off by default. You will need to turn it on manually if still needed. mail-mta/postfix will continue supporting BerkeleyDB until it is sunsetted in Gentoo. Changing the default database and cache types in postfix-3.11.0 requires migration for the entries in main.cf and master.cf that do not specify a database type. A few pointers / suggestions: 1/ Always specify database type in main.cf and master.cf and in your postmap commands. Turn berkdb/lmdb/cdb USE flags on and off as required. Using lmdb, and migrating away from BerkeleyDB, is recommended. As you are always specifying the database type, the default database and cache type settings do not come into play. 2/ Accept the new defaults and migrate to lmdb. The default USE flags take effect and lmdb becomes the new default when >=mail-mta/postfix-3.11.0 is installed. All local database files without a specified type and, optionally, caches need to be migrated to lmdb. If your configuration is simple or if you are familiar with Postfix configuration, a few "grep" commands will find all the problems, and a few edits will be easy to make. Read https://www.postfix.org/NON_BERKELEYDB_README.html#manual for a complete walk through and the commands you can run to find instances of BerkeleyDB usage in your postfix configuration. 3/ If your configuration is too complex for the manual migration step above or if you are not familiar with the details of your postfix configuration, postfix provides enable-redirect[1] and enable-reindex[2] options. Read the documentation for the details and their caveats. They provide valuable help in migration, especially for an operating system that do not have BerkeleyDB support anymore - which is NOT the case for Gentoo. However, these options still help in complex configuration cases. 4/ Turning off lmdb USE flag is not recommended but is possible. The default stays the same as previous versions of postfix, namely hash for local files and btree for caches. No further action is necessary until BerkeleyDB support is sunsetted in Gentoo when you will have to do the above migration. For more details, please read: https://www.postfix.org/NON_BERKELEYDB_README.html [1] https://www.postfix.org/NON_BERKELEYDB_README.html#enable-redirect [2] https://www.postfix.org/NON_BERKELEYDB_README.html#enable-reindex
