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Nextcloud Mail Admin Documentation

Installation

In your Nextcloud, simply navigate to »Apps«, choose the category »Social & Communication«, find the Mail app and enable it. Then open the Mail app from the app menu. Put in your mail account credentials and off you go!

Configuration

Certain advanced or experimental features need to be specifically enabled in your config.php:

Automatic account creation

In cases where an external user back-end is used for both your Nextcloud and your mail server you may want to have imap accounts set up automatically for your users.

Available patterns

Two patterns are available to automatically construct credentials:

  • %USERID%, e.g. jan
  • %EMAIL%, e.g. jan@domain.tld

Minimal configuration

The following minimal configuration will add such an account as soon as the user logs in. The login password is used for the IMAP and SMTP authentication.

Note: Valid values for SSL are 'none', 'ssl' and 'tls'.

  'app.mail.accounts.default' => [
    'email' => '%USERID%@domain.tld',
    'imapHost' => 'imap.domain.tld',
    'imapPort' => 993,
    'imapSslMode' => 'ssl',
    'smtpHost' => 'smtp.domain.tld',
    'smtpPort' => 486,
    'smtpSslMode' => 'tls',
  ],

Advanced configuration

In case you have to tweak IMAP and SMTP username, you can do that too.

  'app.mail.accounts.default' => [
    'email' => '%USERID%@domain.tld',
    'imapHost' => 'imap.domain.tld',
    'imapPort' => 993,
    'imapUser' => '%USERID%@domain.tld',
    'imapSslMode' => 'ssl',
    'smtpHost' => 'smtp.domain.tld',
    'smtpPort' => 486,
    'smtpUser' => '%USERID%@domain.tld',
    'smtpSslMode' => 'tls',
  ],

Timeouts

Depending on your mail host, it may be necessary to increase your IMAP and/or SMTP timeout threshold. Currently IMAP defaults to 20 seconds and SMTP defaults to 2 seconds. They can be changed as follows:

IMAP timeout

'app.mail.imap.timeout' => 20

SMTP timeout

'app.mail.smtp.timeout' => 2

Use php-mail for sending mail

You can use the php-mail function to send mails. This is needed for some webhosters (1&1 (1und1)):

'app.mail.transport' => 'php-mail'

Troubleshooting

Gmail

If you can not access your Gmail account use https://accounts.google.com/DisplayUnlockCaptcha to unlock your account.

Outlook.com

If you can not access your Outlook.com account try to enable the 'Two-Factor Verification' (https://account.live.com/proofs/Manage) and set up an app password (https://account.live.com/proofs/AppPassword), which you then use for the Nextcloud Mail app.

Dovecot IMAP

If your Dovecot IMAP server prefixes all folders with INBOX, Nextcloud Mail does not work correctly.

Check /etc/dovecot/dovecot.conf:

namespace inbox {
        separator = .
        # All folders prefixed
        # prefix = INBOX.
        prefix =
        inbox = yes
        type = private
}