To authorize TrendMicro to send emails on your domain’s behalf you will have to include it in your SPF record. The SPF record mechanism used by TrendMicro is shown below.

include:spf.hes.trendmicro.com

For more information on SPF please click on the button below.

To enable DKIM signing for your domain please reach out to Trend Micro support.

Create a free OnDMARC account to test your configuration.