Dovecot protocols pop3s

CentOS 8 - Postfix SMTP, Dovecot POP IMAP and SSL/TLS

The most important SSL settings are in conf. It indicates that the variable should contain contents of the file, instead of the file name. Not using it will cause an error.

This is insecure, because the plaintext password is exposed to the internet. Depending on how secure they are, the authentication is either fully secure or it could have some ways for it to be attacked. If you have only plaintext mechanisms enabled e. There is unfortunately no way for Dovecot to prevent this behavior. This applies to all connections where the local and the remote IP addresses are equal. You can specify alternative ssl certificate that will be used if the algorithm differs from the primary certificate.

This is useful when migrating to e. ECDSA certificate. It is important to note that having multiple SSL certificates per IP will not be compatible with all clients, especially mobile ones. SSL key files may be password protected. There are two ways to provide Dovecot with the password:. Starting Dovecot with dovecot -p asks the password. For example when using a certificate signed by TDC the correct order is:.

Dovecot v2. Since v2. This will make Dovecot log all the problems it sees with SSL connections. Some errors might be caused by dropped connections, so it could be quite noisy. By default the CommonName field is used.

You may also want to disable the password checking completely. The following commands will enable CA root certificate validation. Dovecot SSL configuration 1. Multiple SSL certificates 1.It indicates that the variable should contain contents of the file, instead of the file name. Not using it will cause an error. The certificate file can be world-readable, since it doesn't contain anything sensitive in fact it's sent to each connecting SSL client.

The key file's permissions should be restricted to only root and possibly ssl-certs group or similar if your OS uses such.

dovecot protocols pop3s

Dovecot opens both of these files while still running as root, so you don't need to give Dovecot any special permissions to read them in fact: do not give dovecot user any permissions to the key file.

The per protocol certificate settings override the global setting. This is insecure, because the plaintext password is exposed to the internet. Depending on how secure they are, the authentication is either fully secure or it could have some ways for it to be attacked. NOTE: If you have only plaintext mechanisms enabled e. There is unfortunately no way for Dovecot to prevent this behavior. The POP3 standard doesn't have an equivalent capability at all, so the POP3 clients can't even know if the server would accept a plaintext authentication.

Note that plaintext authentication is always allowed and SSL not required for connections from localhost, as they're assumed to be secure anyway. This applies to all connections where the local and the remote IP addresses are equal. This is useful when migrating to e. ECDSA certificate. Password protected key files SSL key files may be password protected. It's not stored anywhere, so this method prevents Dovecot from starting automatically at startup.

Note that dovecot. Dovecot v2.

Dovecot SSL configuration

Since v2.Read this page carefully. Dovecot can store email in both mbox and Maildir formats, making it compatible with many existing servers. Dovecot is also very flexible as to where it stores the email.

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It supports many different databases for storing passwords user information. Migration involves several separate tasks. You either need to convert your data or make Dovecot read your existing data. Dovecot is very good at being compatible and configurable, so it is likely to read your existing mailboxes and user and password configurations.

Mailbox subscription list Users would be able to manually subscribe them again if you don't want to mess with it. If POP3 client is configured to keep mails in the server and the messages' UIDLs change, all the messages are downloaded again as new messages.

Don't trust the migration scripts or anything you see in this wiki. Use e. Note that: If a client already saw changed UIDLs and decided to start re-downloading mails, it's unlikely there is anything you can do to stop it.

Even going back to your old server is unlikely to help at that point. Some many? POP3 clients also require that the message ordering is preserved. Some clients re-download all mails if you change the hostname in the client configuration.

Be aware of this when testing. Cucipop mbox: v1. This is the recommended way of doing migrations. Even if you do not, imapsync also supports logging in as an admin user that has the ability to copy message for sub users, and a variety of other authentication options.

None: Migration last edited by TimoSirainen. This documentation is for Dovecot v2.Dovecot is a Mail Delivery Agent, written with security primarily in mind.

It supports the major mailbox formats: mbox or Maildir. This section explain how to set it up as an imap or pop3 server. To install a basic Dovecot server with common pop3 and imap functions, run the following command in the command prompt:.

There are various other Dovecot modules like dovecot-sieve mail filteringdovecot-solr full text searchBy default mbox format is configured, if required you can also use maildir. You should configure your Mail Transport Agent MTA to transfer the incoming mail to the selected type of mailbox if it is different from the one you have configured.

Once you have configured dovecot, restart the Dovecot daemon in order to test your setup:. If you have enabled imap, or pop3, you can also try to log in with the commands telnet localhost pop3 or telnet localhost imap2. If you see something like the following, the installation has been successful:. Dovecot is now automatically configured to use SSL.

Dovecot IMAP/POP3 Server

It uses the package ssl-cert which provides a self signed certificate. Please refer to Certificates for details about how to create self signed SSL certificate.

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Once you create the certificate, you will have a key file and a certificate file that you want to make known in the config shown above. To access your mail server from another computer, you must configure your firewall to allow connections to the server on the necessary ports. IMAP - See the Dovecot website for more information. Also, the Dovecot Ubuntu Wiki page has more details. The material in this document is available under a free license, see Legal for details.

For information on contributing see the Ubuntu Documentation Team wiki page.

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To report errors in this serverguide documentation, file a bug report.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. Now, restart dovecot with sudo service dovecot restart.

Migration to Dovecot

You could run a port scan, with nmap against the network interfaces to verify that dovecot is no longer listening on the ports you wanted to disable. Run nmap scan localhost to scan local host, and nmap scan nnn. If you did everything as in this example, the ports pop3imapimapsshould no longer be listed as open.

Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Postfix and Dovecot opened ports Ask Question.

Asked 6 years, 7 months ago.

dovecot protocols pop3s

Active 4 years, 1 month ago. Viewed 25k times. Could I disable the unsecured protocols, and expect things to work? What if I'm trying to send an e-mail to a server which doesen't have pop3s? Why is submission there? It belongs to Postfix, but what it's his purpose? I'm using Roundcube to read my e-mail, which is hosted on the same server with Postfix and Dovecot.

I'm not using any other e-mail clients. How can I disable imap and imaps from the public? I want only Roundcube to use it. Active Oldest Votes. You could choose which protocol should be enable in the dovecot configuration.The key file's permissions should be restricted to only root and possibly ssl-certs group or similar if your OS uses such.

Dovecot opens both of these files while still running as root, so you don't need to give Dovecot any special permissions to read them in fact: do not give dovecot user any permissions to the key file. They behave exactly the same way then. Multiple SSL certificates This requires v2. With v1. Password protected key files SSL key files may be password protected. It's not stored anywhere, so this method prevents Dovecot from starting automatically at startup.

Note that dovecot. After the initial creation they're by default regenerated every week. With newer computers the generation shouldn't take more than a few seconds, but with older computers it can take as long as half an hour.

Disallowing more won't really gain any security for those using better ciphers, but it does prevent people from accidentally using insecure ciphers. Some errors might be caused by dropped connections, so it could be quite noisy. Note that the CRLs are required to exist.

By default the CommonName field is used. You may also want to disable the password checking completely. Doing this currently circumvents Dovecot's security model so it's not recommended to use it, but it is possible by making the passdb allow logins using any password typically requiring "nopassword" extra field to be returned. This documentation is for Dovecot v1.Dovecot is a Mail Delivery Agent, written with security primarily in mind.

It supports the major mailbox formats: mbox or Maildir. There are various other Dovecot modules including dovecot-sieve mail filteringdovecot-solr full text searchdovecot-antispam spam filter trainingdovecot-ldap user directory. By default mbox format is configured, if required you can also use Maildir. Also see the Dovecot web site to learn about further benefits and details.

Make sure to also configure your Mail Transport Agent MTA to transfer the incoming mail to the selected type of mailbox. You should see something like the following:.

Dovecot is configured to use SSL automatically by default, using the package ssl-cert which provides a self signed certificate. You can instead generate your own custom certificate for Dovecot using opensshfor example:. See certificates-and-security for more details on creating custom certificates.

You can get the SSL certificate from a Certificate Issuing Authority or you can create self-signed one see certificates-and-security for details. Once you create the certificate, you will have a key file and a certificate file that you want to make known in the config shown above.

To access your mail server from another computer, you must configure your firewall to allow connections to the server on the necessary ports. See the Dovecot website for more information. Also, the Dovecot Ubuntu Wiki page has more details.

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Last updated 12 days ago. Help improve this document in the forum. Server Overview Hyperscale Docs. Installation To install a basic Dovecot server with common POP3 and IMAP functions, run the following command: sudo apt install dovecot-imapd dovecot-pop3d There are various other Dovecot modules including dovecot-sieve mail filteringdovecot-solr full text searchdovecot-antispam spam filter trainingdovecot-ldap user directory.

Once you have configured Dovecot, restart its daemon in order to test your setup: sudo service dovecot restart Try to log in with the commands telnet localhost pop3 for POP3 or telnet localhost imap2 for IMAP.

dovecot protocols pop3s

Connected to localhost. Dovecot SSL Configuration Dovecot is configured to use SSL automatically by default, using the package ssl-cert which provides a self signed certificate. Firewall Configuration for an Email Server To access your mail server from another computer, you must configure your firewall to allow connections to the server on the necessary ports.


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