You send from your own domains, which is what lets mailbox providers trust your mail. Adding one takes a few DNS records.
You'll need owner or admin access in Ariyes and the ability to edit DNS at your domain registrar or DNS provider.
DNS changes can take up to about 10 minutes to propagate (sometimes longer). If verification fails immediately after adding the records, wait a few minutes and click Verify again. Double-check for typos or an extra trailing dot in the record values.
When all three records check out, the domain's status changes from pending to verified. Only verified domains can be selected as the "From" domain when you send a campaign or run a sequence — so verify before you build your first send.