Setting Up Secondary Domains for Cold Email: Naming, Redirects and DNS

Your main domain carries your invoices, your support emails, your password resets and every conversation with existing customers. Cold email is the riskiest email you'll ever send. Mixing the two means one bad list can put your billing emails in spam.

So the first rule of our setups is simple: cold email runs on separate domains.

Choosing domain names

Pick names that are clearly connected to your brand, so prospects trust them. For a company at acmelogistics.com:

• tryacmelogistics.com
• acmelogistics.co
• getacmelogistics.com
• acme-logistics.com
• acmelogisticshq.com

Avoid:

• Random names with no link to your brand
• Lots of hyphens or numbers
• Cheap extensions with poor reputations. .com is safest; .co, .io and some country extensions are generally fine

Redirect to your main site

Anyone who types the outreach domain into a browser should land on your real website. Set up a 301 redirect from each outreach domain to your main domain. It makes the domain look legitimate to a curious prospect and to filters that check whether the domain hosts anything.

Age the domain first

New domains are treated with suspicion. Register them, set up DNS and mailboxes, then give them at least two weeks of warm-up before any real campaign.

If you plan to scale, register a few extra domains now and let them age. Replacing a burned domain is much faster when a warmed spare is waiting.

The DNS checklist for each domain

1. MX records for Google Workspace, Microsoft 365 or your own mail server
2. SPF listing only what sends from that domain (keep under 10 lookups)
3. DKIM, 2048-bit key, enabled in the mail platform
4. DMARC, starting at p=none with a reporting address, moving to quarantine once reports look clean
5. Custom tracking domain if you use open or click tracking (why that matters)
6. Redirect to your main website

For our own server-based setups we add reverse DNS (PTR) for every sending IP and BIMI where it makes sense.

Mailboxes

Create 2 to 3 mailboxes per domain using real-sounding names: ravi@, ravi.k@, priya@. Add a profile photo and a simple signature. Avoid sales@ or outreach@ as sending addresses; they look automated.

We explain the volume side in how many cold emails you can send per day.

Keep records

Once you have ten or more domains, keep a simple sheet: domain, registrar, renewal date, mailboxes, warm-up start date, current status. Expired outreach domains that get bought by someone else can cause confusion with prospects who replied months ago.

Doing it at scale

Setting up one domain by hand takes about an hour if nothing goes wrong. Setting up twenty takes a week. We automate domain and mailbox creation, DNS records and warm-up enrolment, which is how we deliver most cold email infrastructure setups within 2 to 3 hours.