SPF

To authorize Bullhorn to send emails on your behalf you will have to include it in your SPF record. The SPF record mechanisms used by Bullhorn are shown below.

a:outbound5.bullhorn.com
a:outbound3.bullhorn.com
a:outbound2.bullhorn.com
a:o1.email.bullhorn.com

DKIM

Bullhorn do not seem to support DKIM at this point. Please contact them for more information.

Create a free OnDMARC account to test your configuration.

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