Configuring Limits and Exceptions | Trend Micro Service Central

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Set limits on the email messages that Deep Discovery Email Inspector processes to:

Improve performance by reducing the total number of email messages required to process
Restrict senders of relayed messages and recipient domains to prevent Deep Discovery Email Inspector from acting as an open mail relay

Note:

Connection control settings take priority over mail relay settings.

Go to Administration > Mail Settings > Limits and Exceptions.

Specify the Message Limits settings:

Option	Description
Maximum message size	Specify maximum message size from 1 to 2047 MB.
Maximum number of recipients	Specify number of recipients from 1 to 99,999.

Specify the Permitted Recipient Domains.
Do one of the following:
- Add an single domain:
  1. Type a domain name.
  2. Click > to include the entry in the Permitted recipient domains list.
- Import a list of domains:
  
  Note:
  Deep Discovery Email Inspector can import domain names from a text file. Ensure that the text file contains only one email address per line.
  1. Click Import From File.
  2. Select a text file and click OK.
  The new entries appear in the Permitted recipient domains list.
Note:
- To export the permitted recipient domain list, click Export and save the text file on your computer. To replicate the same permitted recipient domain settings on several Deep Discovery Email Inspector appliances, import the text file on the target appliances.
- Deep Discovery Email Inspector bypasses SPF and DKIM verifications for domains you configure in the Permitted Recipient Domains list.
  
  For more information, see Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM).
Specify the Permitted Senders of Relayed Mail.
- Deep Discovery Email Inspector only
- Hosts in the same subnet
- Hosts in the same address class
  Note:
  When this option is selected, Deep Discovery Email Inspector will check if the IP address of Deep Discovery Email Inspector and hosts are in the same address class and subnet.
  - Deep Discovery Email Inspector will only allow hosts to relay messages if they are in the same address class and subnet.
    
    For example:
    - Class A: The Deep Discovery Email Inspector IP address is 10.1.2.3, and the hosts’ IP address is 10.1.2.x.
      
      Class B: The Deep Discovery Email Inspector IP address is 172.31.2.3, and the hosts’ IP address is 172.31.x.x.
      
      Class C: The Deep Discovery Email Inspector IP address is 192.168.10.3, and the hosts’ IP address is 192.168.10.x.
  - Deep Discovery Email Inspector will not allow hosts to relay messages if they are in the same address class, but not in the same subnet.
    
    For example:
    - Class A: The Deep Discovery Email Inspector IP address is 10.1.2.3, and the hosts’ IP address is 11.2.3.x.
      
      Class B: The Deep Discovery Email Inspector IP address is 172.31.2.3, and the hosts’ IP address is 172.32.x.x.
      
      Class C: The Deep Discovery Email Inspector IP address is 192.168.10.3, and the hosts’ IP address is 192.168.11.x.
- Specified IP addresses
  
  Note:
  Import settings from a file by clicking Import from a File.
  
  Export settings to a file by clicking Export.
Click Save.