Adding SPF Records | Trend Micro Service Central

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Sender Policy Framework (SPF) is an open standard to prevent sender address forgery. An SPF record is a type of Domain Name Service (DNS) record that identifies which mail servers are permitted to send email messages on behalf of your domain. The purpose of an SPF record is to prevent spammers from sending messages with forged addresses at your domain.

Access your DNS hosting provider's website.
Edit the existing SPF record or create a new TXT record for SPF.
If you have an SPF record for your domain, add required values to the current record for Trend Micro. For example, change the following TXT record:

v=spf1 ip4:x.x.x.x include:spf.example.com ~all

Into:

v=spf1 ip4:x.x.x.x include:spf.hes.trendmicro.com include:spf.example.com ~all

Important:
A domain cannot have more than one TXT record for SPF. If your domain has more than one SPF record, a message delivery or spam classification issue may occur.