To send outbound emails, onboard your domain and configure DNS records (MX, SPF, and DKIM) to authorize secure email delivery.
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Go to Security Settings > Relay > Domains.
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Click Onboard Domain.
The Onboard Domain pop-up appears.
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In the Domain address field, enter the domain address you want to send emails from.
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In the Type section:
External (Default) - Sends emails to recipients outside your organization.
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In the Description field, enter the required description.
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Click Onboard.