Sign In with your
Trend Micro Account
Need Help?
Need More Help?

Create a technical support case if you need further support.

Accepting emails coming only from Hosted Email Security (HES) servers

    • Updated:
    • 10 Feb 2021
    • Product/Version:
    • Hosted Email Security All
    • Platform:
    • N/A
Summary

Identify IP addresses that you can use to accept emails coming only from Hosted Email Security (HES) servers. If you prefer the network to receive emails from HES IP address ranges only, you have to whitelist these HES IP address ranges for incoming SMTP rules on the network firewall.

Below is a sample illustration of whitelisting HES servers IP range(s) on the network firewall. It is a stricter network configuration if all incoming mails should pass first (or be scanned by HES) before entering the corporate network. This is done through MX redirection to HES servers first. If that is the case, you can do further hardening of the network firewall by only allowing incoming SMTP traffic from HES IP range(s).

 
Your network or security administrator should evaluate first this requirement whether your corporate policy requires it or not. Do not implement this without consulting your corporate IT policy.

Whitelisting Trend Micro HES Servers

Details
Public
 
The configuration depends on your network firewall vendor (e.g. Cisco, Palo Alto, pfSense). Kindly consult the network firewall documentation for the step-by-step procedure.

To receive emails coming from HES servers only, configure the firewall to accept emails from the following IP addresses:

For EMEA site:

  • 52.48.127.192/26
  • 52.58.62.192/26
  • 52.58.63.0/25

For all other regions:

  • 54.86.63.64/26
  • 54.219.188.0/26
  • 54.219.191.0/25

Below is a sample scenario using Cisco ASA Firewall. By default, it accepts SMTP traffic from any source IP.

Allow any source IP

After restricting it and allowing emails from HES IP range(s) only, the Source has been changed from "Any" to "TM_HES_IP_RANGE", which is a network object group referring to the individual IP range(s) network object.

TM_HES_IP_RANGE

Network objects

In the sample above, the IP addresses for all other regions were used. The network firewall will only accept SMTP traffic (TCP Port 25) from the specified IP address range(s).

Additionally, if your firewall, MTA, or mail server is configured to check any IP Reputation / RBL service provider, the same set of IP blocks above must be added to the IP Reputation approved list. Another option is to disable the IP Reputation checking on the firewall, MTA, or mail server and let HES handle this task.

For further assistance in configuring your firewall, contact your network administrator.

Premium
Internal
Partner
Rating:
Category:
Configure
Solution Id:
1055066
Feedback
Did this article help you?

Thank you for your feedback!

To help us improve the quality of this article, please leave your email here so we can clarify further your feedback, if neccessary:
We will not send you spam or share your email address.

*This form is automated system. General questions, technical, sales, and product-related issues submitted through this form will not be answered.

If you need additional help, you may try to contact the support team. Contact Support

To help us improve the quality of this article, please leave your email here so we can clarify further your feedback, if neccessary:
We will not send you spam or share your email address.

*This form is automated system. General questions, technical, sales, and product-related issues submitted through this form will not be answered.