Compiling Dovecot From Sources
For most people it is enough to do:
./configure make sudo make install
That installs Dovecot under the /usr/local directory. The configuration file is in /usr/local/etc/dovecot.conf. Logging goes to syslog's mail facility by default, which typically goes to /var/log/mail.log or something similar. If you are in a hurry, you can then jump to QuickConfiguration.
If you have installed some libraries into locations which require special include or library paths, you can pass them in the CPPFLAGS and LDFLAGS environment variables. For example:
CPPFLAGS="-I/opt/openssl/include" LDFLAGS="-L/opt/openssl/lib" ./configure
You'll need to create two users for Dovecot's internal use:
dovenull: Used by untrusted imap-login and pop3-login processes (default_login_user setting).
dovecot: Used by slightly more trusted Dovecot processes (default_internal_user setting).
Both of them should also have their own dovenull and dovecot groups. See UserIds for more information.
Compiling Dovecot From Git
If you got Dovecot from Git, for instance with
git clone https://github.com/dovecot/core.git dovecot
you will first need to run ./autogen.sh to generate the configure script and some other files. This requires that you have the following software/packages installed:
- GNU make.
It is advisable to add --enable-maintainer-mode to the configure script. Thus:
./autogen.sh ./configure --enable-maintainer-mode make sudo make install
For later updates, you can use:
git pull make sudo make install
Compiling Dovecot with rpmbuild (Mandriva, RedHat, etc.)
Fetch the source rpm from ftp://ftp.surfnet.nl/ or any other mirror. At the moment of this writing dovecot-10.rc26.src.rpm can be found in the cooker subtree. If the current release is newer; updating the source rpm is not difficult. Unpack the source rpm with 'rpm -ivh dovecot-10.rc26.src.rpm' to a build environment (/usr/src/rpm...) Copy the newer tarball from the dovecot site to the SOURCES directory of the build environment. Change the dovecot.spec file in the SPECS directory to reflect the new release and the new name of the tarball. The maintainer seems to work with a bz2 tarball; a tar.gz tarball makes no difference Issue a rpmbuild -ba dovecot.spec. The resulting rpm will be placed in RPMS/i586 Install with rpm or urpmi.
rpm -ivh dovecot-1.0.rc26.src.rpm cd /usr/src/rpm mv ~/downloads/dovecot-1.0.rc28.tar.gz ./SOURCES cd SPECS vi dovecot.spec ...edit release and tarball name. Change default options if needed... rpmbuild -ba dovecot.spec cd ../RPMS/i586 urpmi ./dovecot-1.0.rc28-1mdv2007.0.i586.rpm
During this process missing prerequisites may be detected. Install them and rerun the build process. The spec file also need updating for the new add-ons (idxview and logview).
Dovecot was initially built to support both OpenSSL and GNUTLS. GNUTLS has however had some problems and nowadays it does not work any more. Patches to fix it are welcome.
OpenSSL is used by default now, and it should be automatically detected. If it is not, you are missing some header files or libraries, or they are just in a non-standard path. Make sure you have the openssl-dev or a similar package installed, and if it is not in the standard location, set CPPFLAGS and LDFLAGS as shown in the first section above.
By default the SSL certificate is read from /etc/ssl/certs/dovecot.pem and the private key from /etc/ssl/private/dovecot.pem. The /etc/ssl directory can be changed using the --with-ssldir=DIR configure option. Both can of course be overridden from the configuration file.
Solaris and OpenSSL problems
Solaris 10 includes a bundled OpenSSL that does not function correctly with Dovecot when attempting to use SSL/TLS with the default dovecot config. This is because the default setting of ssl_cipher_list in dovecot.conf is HIGH:!ALL; due to import restrictions in some countries (now apparently relaxed) the high level routines are part of the unbundled SUNWcry package and are not available if you don't have this package installed. This confuses the client as dovecot announces support for high level crypto and then cannot deliver. In any case, to resolve this you can alternatively (in decreasing order of simplicity):
Set ssl_cipher_list = MEDIUM:!LOW in dovecot.conf
- Find and install the missing SUNWcry package.
Provide an alternate version of the openssl libraries that doesn't have the high grade routines removed for your protection (sigh). The bundled version of OpenSSL cannot be removed. Installing a newer OpenSSL from source or package (for instance, from http://sunfreeware.com/) will enable Dovecot to work correctly as long as you link against the new OpenSSL. Assuming you are building with the built-in ld, make and gcc, then your build should go something like this (notice the -R required by Sun's linker that sets the runtime linking path in the resulting programs so the OpenSSL libraries load from /usr/local/ssl/lib):
PATH=$PATH:/usr/sfw/bin:/usr/ccs/bin export PATH mv /usr/lib/pkgconfig/openssl.pc /usr/lib/pkgconfig/openssl.pc.orig CPPFLAGS=-I/usr/local/ssl/include \ LDFLAGS='-L/usr/local/ssl/lib -R/usr/local/ssl/lib' \ ./configure --with-ssl=openssl make make install
Note that current inotify is in the Linux kernel since version 2.6.13 and it is preferred over dnotify. If your distribution does not have the required inotify header file, you can get it from the inotify maintainer (this example requires cURL):
mkdir -p /usr/local/include/sys cd /usr/local/include/sys curl ftp://ftp.kernel.org/pub/linux/kernel/people/rml/inotify/headers/inotify.h -O curl ftp://ftp.kernel.org/pub/linux/kernel/people/rml/inotify/headers/inotify-syscalls.h >> inotify.h
/usr/local/include isn't in standard include lookup path, so you'll need to specify that to configure:
CPPFLAGS=-I/usr/local/include ./configure --with-notify=inotify
Debian Etch ships sys/inotify.h wrapped in the inotify-tools package and installs the header file into /usr/include/inotifytools/. To use the header file use:
if ! test -e /usr/include/sys/inotify.h; then aptitude install inotify-tools ln -sf /usr/include/inotifytools/inotify.h /usr/include/sys/inotify.h fi
Then pass CPPFLAGS as in the example above:
CPPFLAGS=-I/usr/include/inotifytools ./configure --with-notify=inotify
Optional Configure Options
- gives a full list of available options
- just lists the options added by the particular package (= Dovecot)
Options are usually listed as --with-something or --enable-something. If you want to disable them, do it as --without-something or --disable-something. There are many default options that come from autoconf, automake or libtool. They are explained elsewhere.
Here is a list of options that Dovecot adds. You should not usually have to change these, but they are described here just for completeness:
- Enables some extra sanity checks. This is mainly useful for developers. It does quite a lot of unnecessary work but should catch some programming mistakes more quickly.
- Enable assertion checks, enabled by default. Disabling them may slightly save some CPU, but if there are bugs they can cause more problems since they are not detected as early.
- Link Dovecot binaries with static libraries instead of dynamic libraries.
- Specifies if we use 32bit or 64bit file offsets in 32bit CPUs. 64bit is the default if the system supports it (Linux and Solaris do). Dropping this to 32bit may save some memory, but it prevents accessing any file larger than 2 GB.
- Specifies memory alignment used for memory allocations. It is needed with many non-x86 systems and it should speed up x86 systems too. Default is 8, to make sure 64bit memory accessing works.
Specifies what I/O loop method to use. Possibilities are select, poll, epoll and kqueue. The default is to use the best method available on your system.
Specifies what file system notification method to use. Possibilities are dnotify, inotify (both on Linux), kqueue (FreeBSD) and none. The default is to use the best method available on your system. See Notify method above for more information.
Specifies what mailbox formats to support. Note: Independent of this option, the formats raw and shared will be always built.
- Build with Solr full text search support
- Build with zlib compression support (default if detected)
- Build with bzip2 compression support (default if detected)
SQL Driver Options
SQL drivers are typically used only for authentication, but they may be used as a lib-dict backend too, which can be used by plugins for different purposes.
- Build with specified SQL drivers. Defaults to all that were found with autodetection.
- Build with PostgreSQL support (requires pgsql-devel, libpq-dev or similar package)
- Build with MySQL support (requires mysql-devel, libmysqlclient15-dev or similar package)
- Build with SQLite3 driver support (requires sqlite-devel, libsqlite3-dev or similar package)
Authentication Backend Options
The basic backends are built if the system is detected to support them:
Build with shadow password support
Build with PAM support
Build with NSS support
- Build with Tru64 SIA support
Build with BSD authentication support (if supported by your OS)
Some backends require extra libraries and are not necessarily wanted, so they are built only if specifically enabled:
- Build with generic SQL support (drivers are enabled separately)
- Build with LDAP support (requires openldap-devel, libldap2-dev or similar package)
- Build with GSSAPI authentication support (requires krb5-devel, libkrb5-dev or similar package)
- Build with vpopmail support (requires vpopmail sources or a devel package)
It's also possible to build these as plugins by giving e.g. --with-sql=plugin.
Dynamic IMAP and POP3 Modules
The mail_plugins setting lists all plugins that Dovecot is supposed to load from the mail_plugin_dir directory at program start. These plugins can do anything they want. They are only expected to contain the <plugin name>_init and <plugin name>_deinit functions which are called at startup and at exit.
The plugin filename is prefixed with a number which specifies the order in which the plugins are loaded. This is important if one plugin depends on another.