MX records and IP addresses for non-EU customers

Updated 3 months ago by admin

This article lists the MX records and IP addresses used by the Cloud USS E-mail Security service.

These records are for customers outside the EU. Before implementing these records on your own system, please check with your Service Provider to see which cluster (US or EU) your account has been created on. Different records exist for EU customers.

MX RECORDS (Inbound)

You should use the following MX records.

You should always reference these records by their DNS name rather than IP address.

Smart Hosts (Outbound)

You should use the following smart hosts for outbound e-mail. Port 25 and 587 are available for outbound email.







IP Addresses

The following IP addresses and ranges are used by E-mail Security to deliver email to your server. Mail delivery operates on the standard SMTP port of 25. Please make sure your firewall and/or email server is configured to accept connections from these IP addresses:
Be sure to use the actual IP addresses in your firewall, rather than hostnames.

SPF Record

If you use an SPF record for your domain, it should be updated to include the following: 
It is recommended that outbound email only be enabled after the Time to Live (TTL) for the SPF record has passed. The use of -all in your SPF record could mean that the remote domain will reject your email if the TTL has not expired.

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