TL;DR

.com domains are better than .us for US expansion – no restrictions, stronger global reputation, and no requirement to prove a physical US presence
Domain age matters for email deliverability – older domains are trusted by mailbox providers; register your .com domain now, even if you’re not sending from it for months
New domains need minimum 60–90 days of warming before cold outreach – send to engaged contacts and existing clients first while building reputation
There are other things to consider for US market entry – legal structure, tax, insurance, state employment laws but this post focuses on the email side

Why This Matters

You’re considering the US market. The US staffing industry is over three times the size of the UK market. Higher margins, bigger talent pool, more competition, and a completely different attitude to email outreach.

Here’s what UK rectuiters get right. Their .co.uk domain isn’t the right fit for a US market, so they switch to a .com. But here’s what most UK recruiters get wrong: they assume email infrastructure is something you just set up just when they’re ready to go live. It’s not. If you’re serious about sending campaigns to the US in 12 months, you should be registering and warming your domain now.

Why? Mailbox providers don’t trust new domains. A brand-new .com that’s never sent email has zero credibility. When you finally want to send outreach, your emails hit spam folders. Your open rates tank before you’ve launched.

The fix is boring and, in the grand scheme of things, costs very little: register your domain months in advance, get a website up and indexed by Google, set up your email authentication records (SPF, DKIM, DMARC), and start using it for things like low-stakes, guaranteed engagement sending (candidate notifications, timesheets, existing-client emails). Let the domain age and build reputation while you’re still focused on your UK operation.

.com vs .us: Which Domain Should You Register?

It’s far to say that all the awesome .com domains have been bought up already. It’s the premium place to be, and there are companies out there that register domains simply to sell them on when some bright spark decides on a company name before checking the domain is available. It’s worth persevering though as .com is the daddy when it comes to domain trust and deliverability.

The short answer: register a .com domain. If you want a .us domain too, fine, but don’t use it as your primary sending domain.

The .us Problem

A .us domain is the internet’s country-code top-level domain for the United States, established in February 1985.

It’s what we call a “ccTLD” or country-code top level domain.

To register a .us domain, you must be a U.S. citizen or resident, a U.S. entity, or a foreign entity with a bona fide presence in the United States. That last part sounds flexible, but “bona fide presence” means substantial, real connections – an office, ongoing business activity, or lawful operations in the US.

More practically: a .us domain signals you’re US-based. If you’re a UK agency testing the US market from the UK, that’s technically false advertising. Your clients will expect a US team, tax compliance, local employment law expertise, and probably a US-based presence.

There’s another restriction that matters: .us registrants must make their WHOIS information public. You can’t use privacy/proxy services. Your real contact details are visible to anyone who looks.

Why .com Wins

A .com domain has zero registration restrictions. Anyone, anywhere can register one. It’s what every US company uses. It ranks better for US searches. Email providers don’t penalize it.

It’s what we call a “gTLD” or generic top level domain

Most critically: older domains generally have a better reputation and are considered more trustworthy by email service providers. A .com domain registered today and given 6–12 months to age will be significantly more trusted by Gmail, Microsoft, and Yahoo than a brand-new domain launched the day you start US campaigns.

Decision: Register your .com domain now. Use it as your primary domain for all US outreach. Don’t bother with .us.

Domain Age and Email Reputation: The Clock Starts Now

Email service providers treat new domains as suspicious by default. This has become more important in recent years, with every year getting harder. Why? Scammers, tricksters and criminals give new domains a bad name, and email security filters around the world know this. You’re just getting caught in the crossfire of this battle.

New domains face extra scrutiny from mailbox providers and blocklists; domain age matters most early on, with sending behavior mattering more long-term.

More specifically: domains greater than 30 days old that are less than 60–90 days old have worse deliverability than old ones; new domains are flagged by age-related blacklists, and the only way to be removed from them is to wait.

In other words, if you register a domain in June and start sending cold outreach in July, you’re fighting age-based blocklists AND reputation scarcity.

Tip: Seek out “aged domains”. These are domains that have been used by someone else then gone up for sale. You might spend a bit more on them, but they can be worth their weight in gold.

Domain Age: Doing the Numbers

Let’s say you register your .com domain today. By the time you want to launch serious US outreach next year, your domain will be 6–12 months old. That’s old enough to be trusted.

If you wait until you’re ready to send outreach to register the domain, your timeline is compressed to weeks. New domains require 2–4 weeks minimum, with older domains needing 1–2 weeks; for outreach above 200 daily sends, 8-12 weeks is the recommended warmup window.

That’s slow. You’re delayed before you even start. And your deliverability numbers will reflect it. You’ll be working from a reputation deficit.

The solution: register your domain now. Lock in the domain age advantage. You’ll thank yourself in 12 months.

Getting Your .com Domain Ready (Now)

Once you’ve registered your domain, here’s what to do:

1. Set Up Email Authentication Records First

Before you send a single email from this domain, configure:

SPF (Sender Policy Framework) – tells mailbox providers which servers are allowed to send email on your behalf
DKIM (DomainKeys Identified Mail) – digitally signs your emails so providers know they haven’t been tampered with
DMARC (Domain-based Message Authentication, Reporting and Conformance) – ties it all together and tells providers what to do if emails fail authentication

You don’t need to send email to set these up. You just add DNS records to your domain registrar. If you’re in Microsoft 365, Google Workspace, or using a third-party email platform, each has guides for this.

Why now? Authentication records take time to propagate through DNS. Setting them up early means they’re fully active before your domain receives scrutiny.

2. Get Your Domain Indexed by Google

Spin up a website and register it in Google Search Console and Google Analytics. This signals to Google (and indirectly to email providers) that your domain is legitimate and active.

You don’t need a full website yet. A simple brochure site with a few pages describing what you do is fine. Build a basic WordPress site for under £200 if needed.

The goal is: domain exists, it’s indexed, it has some basic content, it looks active. If you can get some backlinks too, even better.

3. Use It for Low-Stakes Email

This is the key move most people miss. Don’t leave your domain dormant. Start using it for email that recipients expect and want to receive. Examples:

Candidate notifications from your ATS
Timesheet submissions to contractors
Job alerts to your database
Invoices to clients
Status updates to candidates you’re currently placing

These emails are virtually guaranteed to be marked as “wanted” by recipients. They’re engaged with, rarely complained about, rarely bounce, and can prompt clicks and replies which prove engagement. From an email provider’s perspective, your new domain is being used responsibly.

This process is called “domain warming” and we’ve written a detailed guide on how to warm up your domain if you want the full technical walkthrough.

Acceleration tip: You can use an automated warm-up tool to speed this up. Tools like Warmy.io or Mailreach simulate engagement signals (opens, clicks, replies) alongside your real email activity. If you’re on a tight timeline, they’re worth considering. We’ve reviewed how these tools work and which ones actually deliver for recruitment agencies.

The Domain Warming Timeline: From Registration to Cold Outreach

Let’s map out a realistic timeline for what happens when you register a .com domain today and plan to launch US cold outreach.

Weeks 1–2: Registration & Authentication Setup

Register domain
Add SPF, DKIM, DMARC records
Set up in Google Search Console
Build basic website (or just landing page)

Email sending: None yet. Let DNS propagate.

Weeks 3–4: Light Use Begins

Start sending existing-client emails, candidate notifications, timesheets
Monitor that these land in inboxes, not spam
Check your domain reputation using free tools (Google Postmaster Tools for Gmail traffic, Microsoft SNDS for Outlook)

Daily email volume: 50–150 emails to highly engaged contacts only.

Months 2–3: Ramp Volume Gradually

Continue sending to existing contacts
Start testing newsletters to your candidate database
Monitor bounce rates (should be <2%), spam complaints (should be minimal)

Daily email volume: 150–300 emails, still to engaged/existing contacts.

Month 4 Onwards: You’re Ready for Cold Outreach

Achieving maximum deliverability takes eight to twelve weeks, depending on the targeted volume and engagement.

By this point, your domain is 4+ months old with a clean sending history. You’re ready to ramp cold outreach responsibly.

For new domains, you should warm up for at least 30 days before sending cold email, beginning with 10–15 emails per inbox per day at most.

Even with prior warm-up, you’ll start small: 10–15 cold emails per inbox per day, increasing gradually as your engagement metrics stay healthy.

Timeline Summary: Register today. By this time next year, you’ll have a 12-month-old domain with a track record of legitimate sending. That’s an enormous advantage over a competitor who registers a domain the day they launch.

But That’s Just Email – Here’s What Else You Need to Think About

Domain strategy is critical for email deliverability, but it’s one piece of a much larger expansion puzzle. I’m obviously focused on the email side of things at Quinset. That said, there are plenty of other things that will land on your plate as you think about US market entry:

Legal and employment law – contractor classification (W2, 1099, C2C), state-specific regulations, compliance risks
Tax and payroll – federal, state, and local tax implications; most agencies use an Employer of Record (EOR) or specialist accountant
Insurance – extending your current policies to cover US operations, workers’ compensation if hiring staff
Market selection – picking your initial state/region and vertical (geography and industry matter more in the US than the UK)
Working capital and funding – managing contractor payment terms and longer US payment cycles
Infrastructure and compliance – HR setup, contractor onboarding, benefits administration if applicable

For example, if you’re placing contractors (not just permanent hires), you’ll need to handle W-2 payroll, state tax compliance, and workers’ comp across multiple US states. Most UK agencies use an Employer of Record (EOR) to handle this. Check out this article that gives a breakdown of the EOR requirements and common mistakes if you’re going the contract staffing route.

None of these are trivial, and they all matter for a successful expansion. But they’re outside Quinset’s wheelhouse. If you need guidance on them, get advice from an EOR, legal firm, or international recruitment specialist before you launch.

Back to Email and What This Means for Recruiters

If you’re a recruitment agency owner or manager thinking about the US:

On the email side: Start now. Register your .com domain today. Set up authentication, build a basic web presence, and start using it for low-stakes email (notifications, existing clients, candidates). This sounds boring, but it’s the difference between landing in inboxes and landing in spam when you finally go live with US outreach.

On everything else: Don’t wing it. The US market looks simpler from the UK than it is. Get advice from someone who understands both UK recruitment and US employment law. This might be an EOR, a legal firm, or an accountant with international recruitment experience. The cost of getting this wrong is far higher than the cost of getting it right upfront.

On domain selection: .com, not .us. No restrictions, better reputation, simpler approach.

On the timeline: If you’re serious about the US in 12 months, your work starts now. If you’re serious about the US in 6 months, you’re already behind.

FAQ

What if I register a .com and someone else registers [myagency].us?

They can. .us domains are cheaper and less competitive, so someone might snap it up for speculation. If you’re worried, register both. But use .com as your primary domain.

Can I use my existing .co.uk domain to send to US contacts?

Technically yes, but it signals you’re UK-based. US email providers treat country-code domains as geographic signals. It’s not a deal-breaker, but .com is cleaner. If you’re going US-focused, migrate to .com.

Can I send from both .co.uk and .com under the same Microsoft 365 account?

Yes. You can have both domains configured in the same Microsoft 365 or Google Workspace tenant. Your UK team sends from .co.uk, your US team sends from .com. Both build reputation independently. This is actually a good setup if you’re expanding gradually.

How long before my domain is “ready” for cold outreach?

Minimum 4 weeks of genuine warm-up if your domain already has a solid sending history. For a brand-new domain: 4–6 weeks, or longer if you want to send high volume (200+ emails per day). The research is clear: slower is better. Rushing the process burns your domain’s reputation before you’ve even launched.

Do I need a website for my domain before I send email?

You don’t strictly need one, but it helps. A simple brochure site with 3–5 pages describing your agency and services signals legitimacy to email providers. You can build a basic WordPress site in an afternoon for under £200. Worth the effort.

What if my domain accidentally gets flagged as spam during warm-up?

It happens. If a bulk of your warm-up emails get flagged as spam, your reputation takes a hit. The fix is: stop sending immediately, investigate why (usually bad data or too-aggressive volume), clean your list, and wait 2–3 weeks before resuming. This is why warm-up is cautious and gradual.

Can I use an email warm-up tool to speed this up?

Yes. Tools like Warmy.io or Mailreach can simulate engagement and speed domain reputation building. They work best when combined with genuine warm-up (real emails to real, engaged contacts). If you use them, budget £20–50/month.

Next Steps

If you’re planning a US expansion and email deliverability is a concern – or if you’re already sending to US contacts and hitting spam – your domain strategy is the place to start.

If you need help with your domain setup, timeline, or email infrastructure before launching US campaigns, book a free 30-minute consultation. We’ll walk through what needs to happen and when, and you’ll get practical advice from someone who works with UK recruitment agencies on this transition regularly.

The US market is worth the effort. Starting with domain strategy – not panic – is how you make it work.

Domain Strategy for US Recruitment Market Entry