License & Account

License

On the License page, you can add MailPlus licenses to activate more users or Bitdefender licenses to use their security solutions.

MailPlus licenses

To add a license key:

On the MailPlus tab, click Add License.
To continue the process, you must confirm your agreement to the terms and conditions.
Make sure the network connection is stable and sign in to your Synology Account.
Choose either of the following options:
- Enter an existing license key
- Buy now
Follow the wizard to finish the settings. Once the license is successfully added, MailPlus Server will automatically update the user limit.

Licensing notes:

If any of the following activities is detected, the functions of MailPlus Server will be restricted along with the security-related services suspended until you have enough valid license keys:
- Using an illegal license
- Using an expired license, resulting in the authorized user number being outnumbered by the currently activated users
- Activating more users than the authorized number
If you need to migrate MailPlus licenses to another Synology NAS, refer to the "Migrate MailPlus licenses" section in this article.

Bitdefender licenses

By purchasing licenses in Bitdefender for MailPlus, you can rely on Bitdefender's security engine to guard against spam and viruses.

Licensing notes:

The antispam and antivirus engines will switch to the default ones if the number of valid Bitdefender licenses is less than the number of activated MailPlus users.
If you wish to continue the Bitdefender service, do the following:
1. Add enough licenses in Bitdefender for MailPlus.
2. Go to Security > Antispam or Antivirus. Switch the engines back to Bitdefender.
If you need to migrate Bitdefender licenses to another Synology NAS, please contact Synology Technical Support for assistance.
Note that if there are any existing licenses on the target Synology NAS, they will not be affected by the migration process. The migrated licenses will be displayed separately from the original licenses on the target Synology NAS.

Note:

License status will be synced to your Synology Account. You can check your MailPlus and Bitdefender licenses by signing in to your Synology Account.
You can check the license status on both servers in a high-availability environment. However, it is recommended that you manage licenses only on the primary server to keep the consistency of the license status.

Account

On the Account page, you can select email service users, manage usage quota, and set a policy for a specific user or group. Also, you can set up a delegation policy to grant administrative privileges to another user.

Managing users and groups

To activate email services for users/groups:

Select email service users. You can further customize the mailbox storage quota and remove the data of the deactivated users to control the growth of the server databases.

Go to Account > User/Group to activate email service users.
Select the target user or group and click Set Quota to configure the following settings:
- MailPlus quota: Specify the mailbox size limit. Note that user-level quotas take priority over group-level quotas.
- Remaining capacity notification: Specify the warning threshold to remind users that their mailboxes are approaching the storage limit.
Save the settings.
Click the document icon in the Info column to check the settings.
For users with a deactivated license (e.g., former employees), you can select them and click Clear Data to delete all their emails and personal settings.

To configure the default settings:

Set up the default settings for all unspecified users and groups to save the effort of configuring each user and group one by one.

Go to Account > Settings to configure the following:
- Activate all users by default: Email services will be available to those without any specified status on the User and Group tabs.
- Enable default user quota: A set quota will be automatically applied to those without individual quota and not belonging to any quota-restricted groups. Specify the mailbox quota and the warning threshold in the respective fields.
Save the settings.

To import emails:

Import emails from an SMC or PST file to a user's mailbox.

Go to Account > User and select the user whose emails you wish to import.
Click Import/Export on the upper bar.
Click Import.
Click Browse to upload the SMC or PST file.
Choose either of the following destinations:
- Create a new mailbox: A mailbox will be created to store the imported emails.
- Import to the current mailbox: Emails will be imported into the existing mailbox.
Choose a duplication policy to decide what to do when an email exists in both the user's mailbox and the imported file:
- Skip duplicates: MailPlus will not import the duplicated email.
- Replace duplicates with imported emails: MailPlus will discard the email in the mailbox and replace it with the one from the imported file.
- Keep duplicates: MailPlus will keep both emails.

To export emails:

Export a user's mailbox into a PST file.

Go to Account > User and select the user whose mailbox you wish to export.
Click Import/Export on the upper bar.
Click Export.
Select the target mailbox from the drop-down menu. Choose whether or not to include the sub-mailboxes.
Click Export to download the PST file to your local device.

Note:

Email service activation/deactivation is applied in the following order of priority: User > Group > Settings.

Configuring user policies

To set up user policies:

Set up user policies for specific users or groups to regulate their access to email services and limit their traffic usage.

Go to Account > User Policy.
Click Add (the plus icon) on the top bar.
In the pop-up window, enter a policy name and select a color for identification.

Under Mail Delivery, configure the following rules:

Rule	Yes	No	By domain
Disable auto forwarding	Users cannot auto-forward emails.	Users can auto-forward emails.	Policies will follow the domain settings.

Rule	Value	No value
Daily sending quota (number)	Set the maximum number of total messages that can be sent per day.	Policies will follow the domain settings.
Daily outbound traffic (MB)	Set a size limit for the total messages sent per day.	Policies will follow the domain settings.
Single attachment size (MB)	Set the maximum size of a single email attachment.	Policies will follow the domain settings.

Note that the above rules will override the user's original domain settings if there is any conflict in settings.

Rule	Yes	No
Send mail to internal users only	Users will be restricted to sending emails to internal users only.	Users will not be restricted to sending emails to internal users only.

Under Service, configure the following rules:

Rule	Yes	No
Enable IMAP	Users will be allowed to use IMAP.	Client access via IMAP will be prohibited.
Allow login only from LAN via IMAP	Users can only sign in from a subdomain via IMAP. LAN here refers to the selected network interface in Service > Protocol.	Users will have no restrictions on MailPlus login.
Enable POP3	Users will be allowed to use POP3.	Client access via POP3 will be prohibited.
Allow login only from LAN via POP3	Users can only sign in from a subdomain via POP3. LAN here refers to the selected network interface in Service > Protocol.	Users will have no restrictions on MailPlus login.
Enable full-text search	The server will index email content.	The server will not index email content.

Switch to the Target User tab and select the users or the groups to apply the policy.

To manage user policies:

Select a user policy to perform the following actions using the upper toolbar:

Edit the policy content: Click the pencil icon.
Delete a user policy: Click the trash can icon.
Expand/Collapse a policy: Click the double triangle icon to show or hide the target users or groups.
Change the policy priority: Click the two-way arrow icon or drag and drop the policy to a suitable position. When a user or group is governed by more than one policy, the higher policy takes priority over the lower one.
Search a user policy: Enter keywords in the top search bar.

Note:

You can go to Service > Protocol > Full-Text Search to enable the search function.
If you have disabled IMAP or POP3 on the Service page, users will not be able to sign in even if IMAP or POP3 is enabled by the User Policy.
The Default policy reflects the current status of the related settings and applies to users and groups that are not regulated by any custom policy. It cannot be edited, deleted, or re-prioritized.

Configuring delegation policies

To set up delegation policies:

Delegate users to manage the MailPlus settings (except for the License page) to ease the administrative burden.

Note that DSM administrators can manage all the settings in MailPlus Server. The delegation policy will not affect their administrative rights.

Go to Account > Delegation.
Click Add (the plus icon) on the top bar.

In the pop-up window, enter the following information:

Name: Enter a name for the policy.
Color: Select a color to mark the policy.

Delegation profile: Select a delegation profile to grant the corresponding management privileges.
When you select Domain manager, System administrator, Domain assistant, or System monitor, the system will automatically enable the default permissions of the role. It will switch to Custom when you tick or untick any permissions.
The following table shows which part of the MailPlus settings is associated with each delegated permission:

Section	Delegated permissions	Settings
Server Management	Mail Monitor	Server Management > Mail Monitor
	Server List	Server Management > Server List
	Mail Migration	Server Management > Mail Migration
	Configuration Import	Server Management > Configuration Import
	Threat Monitor	Threat Monitor
	Protocol	Service > Protocol
	Mail Delivery	Mail Delivery > General/Delivery/Relay Control
	MailPlus Client	Service > MailPlus Client
Domain	General	Domain > Edit > General
	User/Group	Domain > Edit > User/Group
	Alias	Domain > Edit > Alias
	Auto BCC	Domain > Edit > Auto BCC
	Quota Usage	Domain > Edit > Usage Limit
	Disclaimer	Domain > Edit > Disclaimer
Security	Mail Delivery Security	Mail Delivery > Security
	Security	Security > Antispam/Antivirus/Content Scan
	Authentication	Security > Authentication
	Data Protection	Security > Data Protection
Auditing	Queue	Queue
	Transaction Log	Auditing > Transaction Log
	Admin Log	Auditing > Admin Log
	Usage Analysis	Auditing > Usage Analysis
	Log Management	Auditing > Log Management
	Archived Log	Auditing > Archived Log
	Report	Auditing > Report
	Mail Search	Auditing > Mail Search
Account	Account	Account > User/Group/Settings
	User Policy	Account > User Policy
	Delegation	Account > Delegation

Switch to the Target User tab and select the users or groups to apply the policy.

To manage delegation policies:

Select a policy to perform the following actions using the upper toolbar:

Edit the policy content: Click the pencil icon.
Delete the policy: Click the trash can icon.
Expand/Collapse a policy: Click the double triangle icon to show or hide the target users and groups.
Change the policy priority: Click the two-way arrow icon or drag and drop the policy to a suitable position. If a user or group is governed by more than one policy, the higher policy takes priority over the lower one.
Search a delegation policy: Enter the policy name or the target users in the top search bar.

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