Queue & Auditing (*administrator only)

Managing the Mail Queue

The Queue page displays the following information regarding messages currently in the queue:

The date and time when the message entered the queue
The message sender and recipient
Why the message is waiting in the mail queue

To view the mail queue:

The Queue page categorizes the current mail queue status into the three types below:

Hold: The message is to be processed.
Active: The message is now being processed.
Deferred: The system fails to deliver the message and will resend it later.

Note:

A single message cannot exceed 2GB in size.
The cause of failed mail delivery will be displayed in the Description field.
By default, deferred messages will be returned to the sender if all redelivery attempts fail during the following 5 days.
A server cannot provide the mail queue information of the other server in the mail system, but its own only.

To manage messages in the mail queue:

You can manage messages currently waiting in the mail queue in the ways below:

Clear: Remove the selected message from the mail queue.
Clear All: Remove all messages from the mail queue.
Resend: Resend the selected message in the mail queue.
Resend All: Resend all messages in the mail queue.
Search: Search messages in the mail queue by sender, recipient, or description.

Auditing Mail and Security Logs

In the Auditing tab, you can view and analyze mail logs regarding incoming/outgoing email messages through your Synology NAS. You can also forward the logs to another server to back them up or to a syslog server for centralized management. Moreover, you can generate daily reports of MailPlus Server's system status.

To view mail and security logs:

You can check log entries about received/sent and suspicious emails.

Go to Auditing > Log.
Select the type of logs from the top menu:
- Mail Log: Show logs regarding sent and received mails.
- Security Log: Show logs regarding malicious mail activities, including spam, virus, malicious contents, and improper actions.
Select the log storage location from the other top menu:
- Internal database: Show logs stored in the system default folder on your Synology NAS.
- External database: Show logs stored in a custom folder on your Synology NAS.
To find specific log entries, enter a keyword in the top-right search field, or click the magnifying glass icon for advanced search.
To back up the logs, click Export on the top-left corner to export them into an HTML file for backup.

Note:

The Mail Log and the Security Log are available only on the primary server.

To view usage analysis:

In the Usage Analysis tab, you can get the analysis of the interaction between MailPlus Server and each email address or domain. By checking the analysis result, you can get the overall condition of the mail system.

Log Management

In the Log Management tab, you can configure the log archive and sending settings.

To archive the logs:

Tick Enable log archive in the Log Management tab.
Select a shared folder as the Archive destination to store the archived logs.
Select one or more weekdays on which to run the log archive task.
Determine the time when the mail system runs the log archive task.
Click Apply to save the settings.

To send the logs elsewhere:

You can send the logs to the following destinations:

The secondary server in the mail cluster: A copy of logs (including postfix log, mail log, and security log) will be sent to this server.
Note: The received mail log and security log must be converted to the format of database before they can be viewed. To perform the conversion, please go to the Log List tab. After the conversion is complete, you can view the logs in the Log tab.
Syslog server: The postfix log will be sent to this server. To get more information on the configuration, please refer to DSM Help > Log Center > Log Sending article.

To rotate the logs:

You can set the the following conditions to trigger the log rotation of the Postfix logs for MailPlus Server:

Log file size is larger than (MB): When the log file size reaches the limit you have specified, these logs will be packed up as an .xz file.
Period of log rotation: The logs will be packed up as an .xz file at the frequency you have specified.

Note: When more than 10 .xz files have been archived, the oldest .xz files will be removed to have space to record new logs.

Log List

The Log List tab displays the log files which are categorized with their sources (main log, received log) and types (mail log, security log, postfix log).
Note: Main logs are the logs on the primary server in the mail cluster. Received logs are the logs forwarded from the primary server to the secondary server in the mail cluster.

In this tab, you can Download and Delete the log files. You can also convert the log files to database format by clicking Generate the log database so as to view the logs in the Log tab.
Note: The deletion of log files may cause the loss of certain important logs.

Report

In the Report tab, you can track the mail system and its traffic by configuring the settings to send the logs periodically.

To send the logs via email:

Select Enable daily report.
Specify the delivery time and recipient's email address.
Click Apply to save the settings.