How to Send 10,000 Cold Emails at Once? (2024)

Gmail, Outlook, and Yahoo don’t allow more than 500 cold emails per day. With a Google Workspace account, you can send up to 2000 emails. But that’s the limit.

To send 10,000 cold emails at once without landing in spam (and also make money with it), you need a strong cold email tool like Smartlead.

In addition, you need 68 secondary domains and 200 email accounts (3 email accounts per secondary domain) to send 10,000 email messages.

In this article, you’ll find:

• Things you need to do to send 10000 outreach emails
• How to send 10000 outreach emails

Let’s dive in.

Things You Need to Do Before Sending 10000 Cold Emails

For this part, I am guessing you already have a primary domain and a few email addresses.

If you don’t have a primary domain yet, buy one before going to the next part.

Sign Up on a Cold Email Tool - Smartlead

If you're thinking how to send bulk cold emails, the first thing you need is a cold emailing software, such as Smartlead. Smartlead lets you add unlimited email accounts, warm up, create cold email campaigns, set follow-ups, schedule bulk emails, etc.

Make a list of your needs and set a budget. Go through the features of a cold email tool and see if those align with your needs before buying a cold email tool.

Not to beat our own drums, but Smartlead is the best option in the market right now. Check this out to learn why.

Buy Secondary Domains & Create 200 Email Accounts

Secondary domains are additional domain names that a business or individual gets to complement their main domain.

For example, our primary domain is smartlead.ai, but our secondary domains are

Secondary domains are vital in sending bulk cold emails for 2 reasons:

• Firstly, they help divide the email-sending load, improving deliverability.
• Secondly, instead of using the primary domain and risking its reputation, you can use the secondary domains. This strategy will prevent potential blacklisting issues of the primary domain.

How many secondary domains do you need for 10,000 cold emails?

If you're thinking how to send 1000 cold emails or more, always split your bulk emails into batches—a max of 50 emails per address.

Let’s get into a little math to find the answer to this question.

You want to send 10,000 emails per day. If you can only send 50 emails per address, you will need 200 email addresses (simply 10,000 by 50) to send 10,000 emails.

Now, it’s recommended to create only 3 email addresses per secondary domain.

So, divide 200 by 3. You need 66 to 67 secondary domains. We always recommend buying one or two extra domains. So, buy around 68 secondary domains to send 10,000 mails.

Similarly, if you're wondering how to send 5000 cold emails, you will need 33 to 34 secondary domains and 100 email addresses.

To send 1000 cold emails, 6 to 7 secondary domains are enough with 20 email accounts.

Add Bulk Email Accounts to the Cold Email Tool

Once you’ve the secondary domains and the 200 email accounts, add them to your cold email tool.

If you’re using Smartlead, check out this article for technical assistance.

Email Authentication - DKIM, SPF, DMARC, and MX Records

SPF- Sender Policy Framework

DKIM - Domain Keys Identified Mail

DMARC - Domain-based Message Authentication, Reporting & Conformance.

MX Record - Mail Exchange record

These abbreviations often confuse the daylights out of SDRs, but that’s okay. You’re not alone. Here’s an article on DKIM, SPF, DMARC, and MX Records to help you with everything related to it.

Warm-Up

Warming up email accounts is a must to see success with cold emails, especially when you’re using new domains and sending 10,000 messages.

Warm up your new email accounts for at least 2 weeks before launching the campaign.

Here are resources to help you out with warm-ups:

For 10,000 messages, use a cold email tool with an AI-based warm-up feature.

How to Send 10000 Cold Emails At Once

Sending 10,000 cold emails is similar to sending 100 emails. The difference lies in the number of secondary domains, the lead list, and how you segment and schedule it.

Take a look at the cold email checklist and practices before launching your outreach campaign. It will save you from many evident mistakes.

Let’s dig in.

Create a Lead List

The easiest way to create a lead list is to get a cold email tool that comes with a contact list building feature.

For instance, with Smartlead, you can opt for this feature (Listkit integration) and create a targeted lead list with just a few clicks on the Smartlead app itself.

If you want to use a separate platform for creating an email list, you have the below options:

• Databases
• Email finders and scrapers

A database is a storehouse of info about potential customers. The information includes industry, contact details, company size, locations, and performance metrics. Using various filters, you can search these databases for potential customers that align with your ICP. Apollo.io is one of the most popular B2B databases. Here’s an article on How to use Apollo to create an effective email list

An email finder or scrapper is a tool designed to retrieve email addresses publicly posted on the internet. Popular email scrappers are Clay, GetProspect, Skrapp.io, Hunter.io, etc.

Here are a few more resources to come up with a lead list:

Note: Always verify the lists before launching campaigns. Use Usebouncer, Bulkemailchecker, and MillionVerifier to verify the contacts.

Upload the Lead List in CSV Format

Organize the downloaded lead list on a Google sheet or Excel doc using various columns to segment it properly.

Now, log in to the Smartlead app and click on the ‘Email Campaign' section from the navigation menu.

On Smartlead, you can either upload the lead list as a CSV file or import it directly from your CRM.

Map the CSV Columns

Next, connect each CSV column to the right dropdown option. If you have extra fields, like "Custom First Line," choose "Custom" in the dropdown. This way, you can include specific info not covered by the standard fields, making your data more personalised.

Afterwards, you will see a pop-up with a summary of the contact list, as shown below.

This summary is extremely crucial for bulk email outreach. Go through it and see if anything needs your attention.

Write the Email Sequence

Once you click “Save & Next”, you will go to the next step—sequences.

This is where you write the email body, subject line, and set the follow-ups for your 10,000-leads cold email campaign.

When writing the email body, check out the “spam checker” section on Smartlead. It will show the words or terms that are likely to alert spam filters.

Go through the results and improve your email copy accordingly.

Set Follow-Ups

Even though you’re sending 10,000 messages, it’s important to follow up to get the best results.

Here’s how we follow up at Smartlead.

Don’t set more than three follow-up emails. Keep a healthy interval between each follow-up email.

Choose Sender Accounts

Once done creating the email sequence, choose the email accounts you want to send from. In this case, you need 200 email accounts for sending 10,000 messages.

That’s it. You’ve launched a 10,000-leads campaign successfully. Now, sit back and check the analytics dashboard on your cold email tool.

Final Thoughts!

Sending 10,000 cold mails is no different than sending 100 messages. The practices remain the same. If anything that changes is the number of secondary domains and email accounts used for that particular campaign.

If you’re a beginner, I recommend starting small. It will help you understand cold emailing as a process and provide a chance to gain a better understanding of your target audience.

For beginners, 10,000 might be an overwhelming volume. But, if you still want to give it a shot, go ahead.

Feel free to reach out to the Smartlead team on the Slack channel or the customer support team if you need any kind of assistance.