Restrict inbound email traffic by IP to prevent bypass of Email Security.cloud

Products

• Email Security.cloud

Issue/Introduction

Learn how to restrict traffic to your mail servers so that inbound email does not bypass Email Security.cloud.

Environment

Email Security.cloud

Resolution

Email Security.cloud IP addresses

To ensure that inbound (incoming) email does not bypass Email Security.cloud, you must implement a restriction to allow email traffic to and from Email Security.cloud IP ranges. This restriction helps prevent spammers from sending email directly to your server's IP address.

Note: Only traffic on port 25 needs to be "locked down" to and from Email Security.cloud IP addresses.

See IP address ranges for Email Security.cloud.

Configure your mail server or firewall

Due to the diverse range of mail servers and firewalls in use, we cannot provide instructions or support for the configuration of IP address allow lists in firewalls or mail servers. Contact your IT department, IT consultant, or software vendor for assistance.

Caution: The suggested mail server or firewall configuration changes should be done only after full MX record propagation is complete.