Cold Email for Beginners: How to Land in the Inbox, Not in Spam

Cold email means writing to someone who does not know you yet. It still works, as long as your email lands in the main inbox. If it lands in spam, nobody reads it, and you never find out why.

This guide is for business owners who have never set this up. Short steps, plain words, and a checklist at the end. You do not need to be technical.

What Are Sender Reputation and Deliverability?

Gmail, Outlook and Yahoo give every sender a score. They look at your domain, your mailboxes and how people react to your emails. That score is your sender reputation.

Deliverability is where your emails end up: the main inbox, the promotions tab or spam. A good reputation puts you in the inbox. A bad one sends you to spam, and people almost never open their spam folder.

Reputation drops when people mark you as spam, when many emails bounce, or when a new mailbox suddenly sends a lot. It goes up slowly, when people open, reply and do not complain.

Why You Should Never Use Your Main Domain

Your main domain, like acme.com, carries your invoices, your client emails and your team's daily mail. If cold email hurts its reputation, all of that can start landing in spam too.

So buy separate domains that look like yours, for example getacme.com or acmehq.com. Make each one redirect to your real website, so anyone who types it in lands on your site. If one of these domains gets a bad reputation, your main domain stays safe.

On each new domain, create no more than 3 mailboxes, with real names like ana@getacme.com. This is a common rule among cold email senders. When you need more volume, add another domain instead of more mailboxes on the same one.

SPF, DKIM and DMARC, Explained Simply

These are three short text records you add to your domain settings, where you bought the domain. Your email provider (Google Workspace or Microsoft 365) shows you what to paste. Each one proves something different:

• SPF is a list of the servers allowed to send email for your domain. It proves the email came from an approved place.
• DKIM adds a hidden signature to every email. It proves nobody changed the email on the way.
• DMARC tells Gmail and Yahoo what to do if an email fails those checks, and sends you reports. It proves the domain owner is watching.

Google asks every sender to set up SPF or DKIM, and asks anyone sending close to 5,000 emails a day to Gmail to set up all three. Yahoo's rules are close to Google's. Set up all three from day one, even at low volume. A DMARC policy of "none" is enough to start.

You will also read about a custom tracking domain. You only need it to track opens and clicks. If you send plain text with no links and no open tracking, you can skip it.

Warm Up New Mailboxes First

A brand new mailbox has no history. If it sends 100 cold emails on day one, providers treat it as a spammer. Warm-up builds that history slowly.

Most sending tools have a warm-up feature. It sends a few emails a day between real mailboxes, opens them and replies, and adds a few more each day. Plan on at least two to three weeks before your first cold email. Instantly's guide calls two weeks the hard minimum and three to four weeks typical. Google gives the same advice for any new sender: start with low volume and increase it slowly.

Keep warm-up running after you start your campaigns. It keeps your reputation steady.

How Many Cold Emails per Day?

Fewer than you think. Sending tools usually put the safe range at 30 to 50 cold emails a day per mailbox once it is warmed up. Instantly says to stay at or below 30, and Smartlead says up to 50.

Start lower than that in your first weeks and add a few each week. Need to reach more people? Add mailboxes and domains. Three mailboxes at 30 a day already make 90 emails a day from one domain.

How to Write the First Email

• Write in plain text, like an email to a colleague. No design, no logo, no banner.
• Put no links in the first email, and no images or attachments. They are common in spam, so filters look at them closely.
• Keep it short: a few sentences someone can read on a phone.
• Say why you are writing to this person, in one line about them.
• End with a simple question, like "Is this something you are looking at this year?" A question is easy to answer.

Save links, case studies and calendar links for the second email, once the person has replied.

Keep Bounces and Spam Complaints Low

A bounce is an email sent to an address that does not exist. Many bounces tell providers you bought a bad list. Verify every address with an email checker before you send, and remove any address that bounces. Google itself advises removing recipients after repeated bounces.

A spam complaint is when someone clicks "Report spam". This hurts more than anything else. Make it easy to say no instead: add one line at the end such as "If this is not for you, just reply and I will not write again", and keep your word.

Google and Yahoo Sender Rules Since 2024

In February 2024 Gmail and Yahoo started applying stricter rules to senders. In short:

• Every sender must set up SPF or DKIM.
• Keep your spam rate below 0.3%, which is 3 complaints per 1,000 emails. Google recommends staying under 0.1%.
• Bulk senders (Google means close to 5,000 emails a day or more to Gmail accounts) must set up SPF, DKIM and DMARC.
• Bulk marketing emails must have a one-click unsubscribe, and unsubscribes must be handled within 2 days.

A small cold email setup is far below 5,000 a day. Still, follow the same spirit: authenticate every domain, keep complaints rare and stop writing to anyone who asks. Rules about cold email itself also differ by country, so check the ones where your buyers are.

Sources: Google email sender guidelines, Google sender guidelines FAQ, Yahoo Sender Hub best practices.

Once your mailboxes are warm, Deberli finds people who just showed a buying signal and writes to them on LinkedIn and email for you. Free for 7 days.

Before Your First Cold Email: Checklist

1. I bought one or two look-alike domains, and they redirect to my website.
2. Each domain has 3 mailboxes or fewer, with real names.
3. SPF, DKIM and DMARC are set up on every sending domain.
4. Every mailbox has been warming up for at least two to three weeks, and warm-up stays on.
5. I start below 30 a day per mailbox and increase slowly.
6. My list is verified, and I remove bounces right away.
7. My first email is plain text, short, with no links, images or attachments, and ends with a question.
8. There is an easy way to say no, and I stop writing to anyone who asks.

More from the blog · Start the free trial