Mailbox sharing between users To enable mailbox sharing, you'll need to create a shared namespace. User's private mail location.
Maildir indexes are shared. Maildir indexes are not shared. The location setting specifies how to access other users' mailboxes. See LDA for how to configure the socket.
This is necessary for storing per-user seen flags. This will only result in mailbox corruption. Filesystem permissions Dovecot assumes that it can access the other users' mailboxes.
Dovecot never modifies existing files' permissions. Shared mailbox listing With the above configuration it's possible to open shared mailboxes if you know their name, but they won't be visible in the mailbox list. This is because Dovecot has no way of knowing what users have shared mailboxes to whom.
Iterating through all users and looking inside their mail directories would be horribly inefficient for more than a couple users. To overcome this problem Dovecot needs a dictionary, which contains the list of users who have shared mailboxes and to whom they have shared. If the users aren't properly listed in this dictionary, their shared mailboxes won't be visible.
Currently there's no way to automatically rebuild this dictionary, so make sure it doesn't get lost. It is the only way to update the shared mailbox list dictionary.
See RFC for more details. Having '-' before the identifier specifies negative rights. Sharing mailboxes to everyone By default Dovecot doesn't allow using the IMAP "anyone" or "authenticated" identifier, because it would be an easy way to spam other users in the system. Every user listed in this table shares his folders with everyone.
See also userdb extra field.
Let's see how negative rights work by testing it on ourself. This documentation is for Dovecot v2.Edit this article. Buy Now. If you have installed the Postfix mail server to operate as the Simple Mail Transfer Protocol SMTP service on an email server, you might still need a way to retrieve the incoming mail from the server.
Dovecot retrieves emails from Postfix and delivers them to the relevant mailbox on the server. This example uses the nano text editor, but you can use any text editor that you want. Uncomment the following lines in the file and, if necessary, change them to reflect your plans for the environment:.
Uncomment the following line in the file and, if necessary, change them to reflect your plans for your environment:. The example in this section adds a mailbox that a hypothetical user named Joe Bloggs joe. Use the following chkconfig command to verify that the Dovecot application will run when the server is restarted:.
After you have added the preceding lines, exit the main. System Status. You can create a user for this example, or you can use an existing user.
If necessary, use the following command to make a new user: sudo useradd joe.Otherwise doveadm 1 will be unable to iterate over all users. This allows an administrator to execute doveadm 1 mail commands through the given socket. This command is used to create one or more mailboxes. This command is used to manage mail crypt plugin cryptographic keys.
Please see doveadm-mailbox-cryptokey 1 for more details. This command deletes a mailbox and expunges all the messages it contains. If the mailbox has any children, they won't be deleted, unless -r is given. To get an overview of existing mailboxes use this command. It's also possible to use wildcards in the mailbox name. When the -s option is present, only subscribed mailboxes will be listed. Listed subscriptions may also contain mailboxes that are already deleted.
The mailbox mutf7 command may be used to convert the international mailbox name into a modified version of the UTF-7 encoding and vice versa. See RFCsection 5. Show the status of one or more mailboxes. The mailbox name may also contain wildcards.
This command uses by default the output formatter flow. Usually this is only ever to be used during migration, or restoring mailbox after disaster. Settings these values is highly discouraged, and is not supported for all mail backends. Purge the dovecot. Most importantly this frees up disk space from mails that were already deleted. Normally there i no need to run this command manually, because the compression is also run automatically.
This command is used to list or change caching decisions for field s in mailbox es. You can list decisions by leaving out decision and last-used parameters.Dovecot is an excellent choice for both small and large installations. It's fast, simple to set up, requires no special administration and it uses very little memory. Released v2.
The mailboxes are transparently indexed, which gives Dovecot its good performance while still providing full compatibility with existing mailbox handling tools. Dovecot is standards compliant.Mail Server Postfix Dovecot MariaDB - Part 2 : Install Postfix - Dovecot and Create database
Dovecot v1. Dovecot's indexes are self-optimizing. They contain exactly what the user's client commonly needs, no more and no less. Dovecot is self-healing. It tries to fix most of the problems it notices by itself, such as broken index files. The problems are however logged so the administrator can later try to figure out what caused them. Dovecot tries to be admin-friendly. Common error messages are made as easily understandable as possible.
Any crash, no matter how it happened, is considered a bug that will be fixed. Dovecot allows mailboxes and their indexes to be modified by multiple computers at the same time, while still performing well. This means that Dovecot works well with clustered filesystems. NFS has caching problemsbut you can work around them with director proxies.
Dovecot's user authentication is extremely flexible and feature-rich, supporting many different authentication databases and mechanisms. Postfix 2.
Since the workarounds may cause the protocol exchange to be suboptimal, you can enable only the workarounds you need. Dovecot's design and implementation is highly focused on security.
Rather than taking the traditional road of just fixing vulnerabilities whenever someone happens to report them, I offer EUR of my own money to the first person to find a security hole from Dovecot.Virtual Users There are many ways to configure Dovecot to use virtual users. If you have no idea how you want your users to be configured, select some HOWTO and follow its instructions. However from Dovecot's point of view there isn't much of a difference between them.
If a passwd lookup and a SQL lookup return the same userdb information, Dovecot's behavior is identical. Password and user databases Dovecot supports many different password databases and user databases. IMAP and POP3 protocols currently have no concept of "domain", so the username is just something that shows up in your logs and maybe in some configuration, but they have no direct functionality.
So although Dovecot makes it easier to handle "user domain" style usernames eg. However some authentication mechanisms do have an explicit support for realms pretty much the same as domains. If those mechanisms are used, the username is changed to be "user realm".
And of course there's no need to have domains at all in the usernames. Passwords The password can be in any format that Dovecot supportsbut you need to tell the format to Dovecot because it won't try to guess it. So don't put dovecot into the mail group, and don't make mails owned by the dovecot user.
That will only make your Dovecot installation less secure. So, if not the dovecot user, what then? You can decide that yourself. You can create, for example, one vmail user which owns all the mails, or you can assign a separate UID for each user. See UserIds gids for more information. Home directories Some people are opposed to the idea of virtual users having home directories, but no matter what you call it, it's a good idea to have a directory where user-specific configuration and other state is stored.
Usually you shouldn't need this. The usernames in the passwd and shadow files are expected to contain only the user part, no domain. This documentation is for Dovecot v2.Using NSS you can configure the lookups to be done from elsewhere e.
See passwd userdb configuration for how to set this up. This is good from security point of view, because it means that the kernel will also prevent users from accessing each others' mails. If the users have direct write access to the mail files eg. That may generate all kinds of error messages to Dovecot's error logs, so it may be sometimes difficult to tell if there really is a problem or if user is just doing something stupid.
If users are going to access the mailboxes with other software than Dovecot, it's important to make sure that their mailbox accesses are compatible. This mostly means that with mboxes you must make sure that everyone uses the same locking methods in the same order. Dovecot can easily support non-system passwords for system users. If you wish to use non-system passwords, you can use pretty much any of the Dovecot's password databasesbut for simple installations you'll probably want to use passwd-file.
User database for system users is always passwd. You may decide to use these, or use maildir format instead. This makes it sure that Dovecot behaves correctly also when the user's mailbox doesn't exist at the moment eg. If Dovecot can't figure out where the existing mails are, it simply gives an error message and quits. It never tries to create a missing mailbox when autodetection is used.
See MailLocation for more information how to configure the mailbox location. Below are the highlights for mbox and maildir.
IMAP protocol supports multiple mailboxes however, so Dovecot needs some directory where to store the other mailboxes. All of these locations are included in mailbox location autodetection. See locking section in mbox for more information.
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Dovecot Master User: Access user's mailbox without owner's password.
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