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Mail

This first tab is used to set system postfix and Cyrus settings.

The "Max child" default value is 200 – when it is left empty.

Postfix

  • My networks
    The list of "trusted" SMTP clients that have more privileges than "strangers". 
    Specify a list of network/netmask patterns, separated by commas and/or whitespace, for instance:

    127.0.0.0/8, 192.168.198.0/24

    For more information see  http://www.postfix.org/postconf.5.html#mynetworks

  • Maximum message size
    The maximum size (MiB) of messages that users are allowed to send.

    Warning, this is the size of messages, not including the attachments they may contain.

    After files are converted to be attached to an email message, their size increases: allow for an extra 50% approximately.
    For example, if you want to allow attachments up to 10MB, you must set maximum message size to 15MB.

    Once the size has been changed, you must restart the IMAP proxy:

    service bm-ips restart

    Maximum limit

    The maximum size of messages handled by BlueMind can't exceed 100MB.

  • Relay
    Specify the address of the relay through which outgoing messages must pass.


The MiB (Mebibyte) is a multiple of a byte, not to be confused with the MB (megabyte): it equals 1,024 kebibytes, which equals 1,024 bytes.

Therefore, 9 MiB equal 9.43718 MB.

Cyrus

  • Max child
    This field sets the maximum number of IMAP processes Cyrus is able to start, by default it is set to 200.
    It may be useful, and possibly necessary, to increase it, for example if you encounter identification issues.

Reverse Proxy

The "Reverse Proxy" tab is used to set:

  • setup wizard's password generated automatically by BlueMind during installation.

    The logged-in administrator will not be asked for the old password, which means the password can be changed here in case it is lost.

  • worker_connections: the maximum number of simultaneous connections that can be opened by a worker process.
    One worker works for one connection, therefore worker_connections = number of (possibly) active connections at the same time. Most of the time, worker_connections = number of users.

    In order to best adapt this parameter's value, you can run the command on the server to find out the number active connections at a given point in time, e.g. during weekdays:

    ss -p | grep nginx | grep -i estab | wc -l

EAS Server

The "EAS Server" tab gives you access to the Exchange Active Sync server configurations options, which handles mobile devices syncing.

    • Allow unknown devices
      This option, which is disabled by default, authorizes any user to connect new mobile devices to their account. If the box isn't checked, authorizations must be validated individually for each user and device.

      When peripheral devices are associated to an account, go to the user's configuration panel in order to revoke them.

    • Min/max push timeout
      Minimum and maximum intervals for push notifications to be sent to mobile devices.
      Users are able to configure this mode and be alerted of new emails automatically. The device no longer queries the server, the server sends information to their device instead.

Authentication

This tab is used to set:

Filehosting

This tab is used to set the default values for newly created domains, it does not set or override the values for all domains.

  • Retention time (days): number of days files will be kept on the server, from the original sent date.
  • Auto detachment limit (MiB): size for which email attachments are automatically added as links.
  • Maximum linked attachment size (MiB): maximum file size permitted.
    This is the maximum size permitted per file, several files whose total size exceeds the limit can be attached to and detached from a single email message provided each individual file does not exceed the limit.
  • Backup File hosting data: if this box is checked, the storage folder on the server will be included in BlueMind backup tasks.

The MiB (mebibyte) is a multiple of a byte, not to be confused with the MB (megabyte): it equals 1,024 kebibytes, which equals 1,024 bytes.

Therefore, 9 MiB equal 9.43718 MB.

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