Subdomain or root domain - Sendbaze

You can verify either yourshop.co.za or a subdomain such as mail.yourshop.co.za. Both work; the choice affects reputation and DNS hygiene.

Separate reputation. Receivers track reputation per domain. If a campaign performs badly, the mail your staff send from Google Workspace or Microsoft 365 on the root domain is unaffected.
No DNS conflicts. Your root domain already has MX and SPF records for your mailbox provider. A subdomain starts empty.
Clear intent. orders@notify.yourshop.co.za tells people, and filters, what kind of mail it is.

Good names: mail, notify, send, updates. Use another one, such as news, for marketing so the two classes never share a reputation.

When the root domain is right

Small teams that want replies to land in the same mailbox, or brands whose customers expect @yourshop.co.za exactly, can verify the root. Nothing else changes: the DKIM records still go on _domainkey hosts and the return path still lives on the mail subdomain, so your existing MX and SPF stay untouched.

Subdomains of a verified domain

Once yourshop.co.za is verified, from may use any subdomain (orders@notify.yourshop.co.za) without extra set-up. The reverse is not true: verifying notify.yourshop.co.za does not let you send from yourshop.co.za.

Limits

The number of verified domains depends on your plan; see plans. Adding one beyond the limit fails with 403 plan_limit; the error body carries the limit and an upgradeUrl.