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Domain authentication or Send From authentication shows email providers that rasa.io has your permission to send emails on your behalf.
To give rasa.io permission, you point DNS (Domain Name System) entries from your DNS provider to rasa.io.
This means your recipients will no longer see the “via rasa.io” message on your emails.
This has a huge impact as your reputation as a sender and your email deliverability which is something we care about very much at rasa.io.
Email service providers distrust messages that do not have domain authentication set up because they can not be sure that the message actually comes from you. Explicitly stating this increases your reputation with email service providers ensuring they do not filter you out of inboxes and shows your recipients that this comes from you so they do not mark you as spam.
DNS refers to the domain name that you want to send emails from. For example, animalsthatread.com.
The CNAME record creates an alias for subdomain.yourdomain.com and points to rasa.io. The CNAME is needed for our click and open tracking features in order for those statistics to be routed back to your rasa.io account. This will also be what your messages are signed by, so your recipients will be able to see what you have chosen for your CNAME. You set up the CNAME files that rasa.io provides with your DNS host.
To set up domain authentication, you must submit the DNS records provided by rasa.io to your DNS or hosting provider. First, figure out who your hosting provider is and if you have access. If you don’t have access to your DNS or hosting provider, you should figure out who in your company has this access before you begin set up. Please note that rasa.io cannot authenticate  gmail.com outlook.com or yahoo.com.
To Set Up Domain Authentication:
Type in the desired domain
Your domain needs to match the domain of your from address on the emails you are sending out. For example, if you are sending an email from hello@animalsthatread.com, then enter your domain as animalsthatread.com
Next you need to add all the CNAME records that appear on the screen after you hit authenticate. You will need to add these records to your DNS host. This process will vary depending on your DNS host.
It can take up to 48 hours for records to verify after you upload them into your DNS host.
Once you add your CNAME records to your DNS host, return to the Domain Authentication page and click verify.
Any time that you send an email with a FROM address whose domain matches the domain set in the domain authentication, rasa.io applies that domain to your email. You only need to update your domain authentication if you want to update the domain you are emailing from.