SPF
To authorize Cisco RES / CRES service to send emails on your behalf you will have to include the following SPF mechanism to your SPF record.
include:res.cisco.com
Cisco RES / CRES SPF record set up
Authorize Cisco Registered Envelope Service to send emails using your domain by authorizing them in your SPF record.
Written by Ivan Kovachev. Updated over a week ago
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