My Gmail address or my sending domain: which one is my main email, which is for outreach, and do I need both?

You have a Google Workspace address on your own domain, and you may also have added a sending domain such as mail.yourdomain.com. This page says which one KM Hub treats as your main email, what the second one is for, whether you need both, and why the domain step asks for a handful of DNS records.

Two senders, two jobs

Open Settings (Your Account), then the Account & Domain group, then the Email Senders tab. The panel at the top, Connect two professional email senders, is the whole model:

1. 1. Primary business email: admin, client replies, quotes, invoices and newsletters. This is your trusted business address, for example your Google Workspace mailbox.
2. 2. Outreach email: cold outreach only, on a separate domain, so outreach problems cannot damage your main domain. The screen notes this is sometimes called a burner domain, that it should still be a real domain you own with a monitored inbox, and that ideally it is a different root domain, not just another inbox on your main one.

Do you need both? No. As the panel says, your setup can work with one sender; two is the recommended finish. None of this changes your KM Hub sign-in email or your private notifications. It only changes how outbound email goes out.

Set up the primary sender with your Gmail

On the same tab, find the card Send from your Gmail (Google Workspace) and click Connect Gmail sending. Sign in with your business address (personal @gmail.com addresses are not supported). Under Send outbound email via, pick Your Gmail to send from your own account, with every message in your own Sent folder, or Resend domain to send through a verified domain instead. If a Gmail send ever fails, KM Hub falls back to your Resend domain on its own.

What a sending domain is, and the DNS records

A sending domain lets KM Hub send on your behalf through its own warmed infrastructure. Under Your sending domains and email roles, type the domain in Add a sending domain and click Add Domain. A root domain or a subdomain like mail.yourdomain.com are both accepted.

KM Hub then asks the mail provider for the exact records that domain needs. Click Set up manually (N DNS records) to see them: normally a DKIM TXT record and two SPF records (one TXT, one MX with a priority) for the send address. Create each one at your DNS host using the copy buttons, then click Verify. The status pill moves from Not started or Pending DNS to Verified. Refresh re-checks, and Check DNS reports the DMARC record separately (it shows DMARC not finished until one exists).

If you saw only one record somewhere else, that was the Custom Domain tab next door: it holds a single A or CNAME record for your website address, a different job.

Not comfortable with DNS? Click Send these records to someone else to hand the exact records to whoever manages your domain. On Namecheap, Set these up automatically writes them for you.

Tell each address what it does

Each verified domain carries Used for chips: General (reference), Outreach only, Newsletters, Quotes / invoices (reference). Tag your outreach domain Outreach only and click Make main default on your trusted business domain.

If Verify shows an error about a status check

An error that names org_sending_domains_status_check is a fault on our side, not in your records. Submit a ticket with the domain name and we will clear it.