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Setup

Setting up a sending domain. The cheapest insurance you will buy.

Twelve dollars a year buys you a domain whose only job is cold outreach. If deliverability ever degrades — and over a long enough run, something eventually goes wrong — the damage stays there. Your invoices, your client threads, your password resets and your reputation with existing customers are untouched. There is no cheaper insurance in this business.

Why not just use your main domain

Because your main domain carries everything that matters. Quotes, contracts, invoices, booking confirmations, password resets. A deliverability problem there does not just mean prospects miss your pitch — it means a client does not receive an invoice, and you find out three weeks later when the payment is late.

Cold outreach is inherently the riskiest mail you will ever send: to people who did not ask for it, at volume, from templates you are still refining. Keeping that traffic away from the domain your business depends on is basic separation of concerns.

Choosing the name

Configuring it

1
Buy the domain at any registrar. This is a commodity — price is the only real difference.
2
Connect it to an email provider. Google Workspace, Microsoft 365, Zoho and others all work. You need real mailboxes, not just a forwarding rule, so that replies arrive somewhere a human reads.
3
Add SPF, DKIM and DMARC. Your provider gives you the exact values. This step is not optional — see SPF, DKIM and DMARC explained.
4
Set up forwarding to your real inbox, so replies reach you without needing to check a second mailbox all day. Reply from the sending address, though, not your main one.
5
Warm it up before real volume. A new domain needs two to four weeks of gradual sending — see email warm-up explained.

One detail people miss

Put a real website on the sending domain, even a single page. It can simply redirect to your main site. A domain sending business email with nothing at all behind it is a small negative signal, and it looks odd to any recipient who types the address into a browser to check whether you are real — which is exactly what a careful prospect does.

Common questions

How many sending domains do I need?

One is enough for most small businesses at moderate volume. You add domains when you need more volume than a single domain can safely carry, or when you are running genuinely separate campaigns to different markets. Adding domains is the safe way to scale; pushing one domain harder is not.

Can I use a subdomain instead of a separate domain?

You can, and it is better than using your main domain directly, but subdomains share some reputation with the parent. For twelve dollars a year, full separation removes the question entirely.

Should the sending domain have its own website?

Yes, even a redirect to your main site. It costs nothing, removes a small negative signal, and satisfies the prospect who checks whether you exist before replying.

Do I reply from the sending domain or my main one?

Reply from the sending domain, so the conversation stays consistent and the thread history stays intact. Set up forwarding so you see replies without living in a second inbox. Once a conversation becomes a real client relationship, moving it to your main domain is natural.

Keep reading
SPF, DKIM and DMARC explained Email warm-up, explained The full deliverability checklist

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