Dovecot pop3_uidl_format setting is missing from config file

Dovecot can be secured just like any other service. When connecting to the service for the first time, you will receive a warning message because they are self-signed and not CA certificates. To complete the setup, you need to make sure that the ports are open in the firewall.

Open the following ports for the service:. One thing I learned as a system administrator is that the server logs will tell you what the server is trying to do based on how you have it set up. Based on that information, you can figure out what issue the service is having. Mailing issues can be a pain because delays can happen through middlemen that are not related to the server at all, and diagnosing these issues can take not just time, but a trained eye coming from experience.

Learning where things are, the way to install services, how they function together, and how to identify problems in the logs can help in the long run when maintaining the environment. And keeping the boss and customers happy. I currently work as a technical support team manager for JetRails. I have been working with Linux and OpenSource tools for a decade, constantly wanting to make new resolutions for obstacles and always training others on improving systems as a systems administrator.

More about me. Relive our April event with demos, keynotes, and technical sessions from experts, all available on demand. This sets the time to live for negative hits i. The value 0 completely disables caching of these hits. Values: Size. This determines the time to live for cached data. After the TTL expires, the cached record is no longer used, unless the main database look-up returns internal failure.

Values: Boolean. The password is checked correctly, but all the passdb extra fields are lost. The auth master process by default is responsible for the hash verifications. Setting this to yes moves the verification to auth-worker processes. This allows distributing the hash calculations to multiple CPU cores, which could make sense if strong hashes are used.

This setting adjusts log verbosity. In the event of password mismatches, the passwords and the scheme used are logged so that the problem can be debugged.

The setting is used for both SASL realms and appending an domain element to the username in plaintext logins. This setting defines the interval for which the authentication process flushes all auth failures. Thus, this is the maximum interval a user may encounter. If you want to allow master users to log in by specifying the master username within the normal username string i. Values: plain , login , digest-md5 , cram-md5 , ntlm , rpa , apop , anonymous , gssapi , otp , skey , gss-spnego.

Values: md4 , md5 , sha1 , sha , sha Values: Unsigned integer. If yes , no request is made to the policy server. If no , there will be no report for the authentication result. Auth variables. Logged in user. Values: Millisecond Time. URL is appended with? This setting supplies a space-separated list of realms for those SASL authentication mechanisms that need them. Realms are an integral part of Digest-MD5.

If yes , authentication fails when a valid SSL client certificate is not provided. Dovecot SSL configuration. Generally, this will be either commonName or xUniqueIdentifier. By default the CommonName field is used. The value is a string formed of sets of from and to characters alternating.

If yes , log unsuccessful authentication attempts and why they failed. Values: no , yes , plain , sha1. In case of password mismatches, log the attempted password. You can also truncate the logged password to n chars by appending :n e. The auth workers are used to execute blocking passdb and userdb queries e.

They are automatically created and destroyed as necessary. Default: 1 M. The cache should be large enough to allow keeping the full, parsed Dovecot configuration in memory. The default is almost always large enough, unless your system has numerous large TLS certificates in the configuration.

Once this number of connections is reached, the next incoming connection prompts spawning of another process. If a process is idle after this much time has elapsed, it is notified that it should terminate itself if inactive. Unprivileged processes run under the ID of the internal user.

This user should be distinct from the login user, to prevent login processes from disturbing other processes. Designed to catch processes that leak memory so that they can be terminated before they use up all the available resources. Global variables. Points to a Berkeley DB config file. The doveadm director flush command removes all user associations either from the given host or all hosts. All the existing connections will be kicked. This setting points to a file path of a flush script that is automatically executed when the flush command is run.

Values: IP Addresses. This list is used to bootstrap a Director ring; backend hosts can be dynamically added to a running ring via the doveadm commands. This default can be overridden with doveadm director flush --max-parallel parameter. This allows configuring the max buffer size for outgoing connections.

If the max buffer size is reached, the connection is disconnected and reconnected. Minimum time to wait for a reply to PING that was sent to another director before disconnecting and reconnecting. Maximum time to wait for a reply to PING that was sent to another director before disconnecting and reconnecting. A list of IP addresses or hostnames for all Director servers, including the machine on which the setting is made.

This list is used to bootstrap a Director ring; directors can be dynamically added to a running ring via the doveadm commands. How long to keep routing information in the Director ring after a user has no more active connections. How long to wait after a user has been kicked from the Director ring before that user can log in to the new server. How the username is translated before being hashed. Username username domain. See Running Dovecot and Dovecot Logging.

Password databases passdb. User Databases userdb. Dovecot Logging. Running Dovecot. Quick search. UID of user 'mail'. GID of group 'mail'. Authentication and password database. Log unsuccessful authentication attempts and the reasons why they failed. Even more verbose logging for debugging purposes.

Shows for example SQL. The userdb below is used only by LDA if prefetch driver is enabled above. Number of connections to handle before starting a new process. Number of processes to always keep waiting for more connections. Create inet listener only if you can't use the above UNIX socket.

Avoid making LMTP visible for the entire internet. Most of the memory goes to mmap ing files. You may need to increase this. It's typically. Its default.

Users that have access to this socket are able to get a list.