Cold Outreach From a New Domain Without Getting Blocked

A new domain has no reputation, and mailbox providers treat no reputation as suspicious. Send two hundred near-identical emails from it on day one and the domain is filtered into spam for months, taking your ordinary customer email with it. Cold outreach from a small business can work, but only when it looks like what it should be: one person writing to one other person, slowly, from a domain that is properly set up. This guide is the version that keeps the domain usable.

Quick answer

Authenticate the domain fully, send from a real person's mailbox, start at ten or twenty emails a day and grow over a month, write each message for the one person receiving it, stop the moment someone replies or asks you to, and keep the bounce rate near zero by checking addresses first. Use a second domain for outreach if you cannot afford any risk to the main one; the free plan gives you three.

Before the first email

1. Set up SPF, DKIM and DMARC for the domain, and check them with the deliverability checklist. Unauthenticated cold mail is rejected outright by Gmail and Outlook now.
2. Give the domain a website with a real page about who you are. Filters and recipients both look.
3. Send from a person's mailbox, name@yourdomain.com, with a normal signature, a phone number and a postal address. Not from sales@ and never from a no-reply address.
4. Use the domain for ordinary email for a week or two first: colleagues, suppliers, people who will reply. Replies are what a domain's reputation is built from.
5. Decide whether to use a separate domain. If the main domain carries invoices and support, a second domain such as yourbrand-team.com protects it; the second domain guide shows the setup, and it costs only the registration.

How many, how fast

Week one, ten to twenty a day. Week two, thirty to fifty. By week four, a mailbox that is getting replies can send around a hundred a day without trouble. The limits on the free plan, 250 a day per mailbox and 10 a minute, are above what a cold mailbox should ever do; a new workspace is also limited to four recipients per message, which does not matter for outreach because every message goes to one person. Spread sends through the working day rather than in one burst at 9 am, and do not send at all at weekends.

Writing the message

• One recipient, one message, written for them. The first sentence names something specific about their business that you could only know by looking.
• Plain text, under 120 words, no images, no tracking pixels, at most one link, and not in the first email if you can avoid it.
• A subject line that reads like a colleague's, not a campaign's: "question about your Leeds depot", not "Boost Your Logistics ROI".
• One small ask: a reply, a yes or no, a fifteen-minute call. Not a demo, a download and a calendar link all at once.
• A plain line at the end saying who you are, where you are, and that a reply saying "no thanks" ends it. That line is a legal requirement in several countries and a courtesy everywhere.
• One follow-up a week later, in the same thread, then stop. Three follow-ups is a pattern filters recognise.

The legal basics

Cold business email is lawful in many places and restricted in others, and a small business cannot afford to get it wrong. In the United States, CAN-SPAM requires a truthful header and subject, a postal address, and an opt-out that is honoured within ten business days. In the UK, email to a business address is generally permitted under PECR if you identify yourself and offer an opt-out, and GDPR still applies to the person's data. In Germany and several other EU countries, consent is required even for business addresses. Canada's CASL requires consent with narrow exceptions. Australia's Spam Act requires consent and identification. Check the rules for the country you are sending to, keep a record of where each address came from, and never buy a list; purchased lists are both the legal risk and the deliverability risk in one file.

Protecting the domain

• Check every address before sending, using the address check guide. A bounce rate above two or three percent is the fastest way to a blocked domain.
• Stop sending to a company the moment anyone there replies "no", and record it so nobody else writes to them.
• Watch for replies landing in spam at the recipient's end: silence from a hundred people is a signal. The Gmail spam guide covers the checks.
• Keep outreach and customer email in separate mailboxes even on the same domain, so a bad week in one does not pollute the other's sent history.
• If the domain does end up filtered, stop for a month and send only to people who reply. Reputation recovers; it just does not recover while you keep sending.

Common questions

Can I use the API for this?

You can, and for personalised one-to-one messages it is a fine way to send them one at a time from a real mailbox, with the same daily limits. It is not a way around the slow start; the domain's reputation does not know or care how the message was sent.

Should I use a cold-email tool instead?

Those tools send from your mailbox anyway, over SMTP, so the rules above still apply. They help with follow-up scheduling and reply tracking; they do not make a new domain trustworthy any faster.

Is a .com needed for outreach?

No, but a familiar ending helps. A domain ending that is sold for under a dollar is the kind spammers use, and some filters treat it with suspicion before reading a word.