To allow QuestionPro to send emails on your behalf, you will have to add them to your SPF record. The SPF mechanism used by QuestionPro is shown below.
You can configure DKIM support through your QuestionPro portal.
QuestionPro will generate a public and private key pair. Please add a TXT record of the public key that will be shared with you to your domain.
Create a free OnDMARC account to test your configuration.