This article shows you how to correctly set up your domains & mailboxes with regard to cold email.

Efficiently setting up a domain and mailbox for cold email campaigns is a strategic process that demands meticulous attention to detail.

So, how do we set up domains and mailboxes to run cold email campaigns?

It all begins with the domain. A domain name is a distinct, memorable identifier used to navigate to websites like or

From establishing your email-sending capacity to ensuring authentication protocols, each step is essential to the success of your outreach efforts.

Consider domain reputation, compliance, and deliverability nuances to navigate the complexities of cold email setup effectively.

Stay tuned to unravel the intricacies of building a robust foundation for your cold email strategy.

domain and mailbox setup meme

Why Do You Need Burner Domains for Cold Email Campaigns?

Dedicated domains are necessary for cold email campaigns because they are pivotal in safeguarding primary business communications and nurturing a reputable sender identity.

Utilizing separate burner domains for cold outreach protects your business domain reputation inbox from spam traps.

Moreover, dedicated secondary domains allow you to scale quickly for cold outreach.

Step #1: Determine Your Sending Capacity

Determining the ideal sending capacity is an essential initial step in planning your cold email campaign strategy. Before setting up your domain, you must calculate your daily volumes and email-sending capabilities.

For instance, if you aim to send 1,000 emails daily, you will need multiple domains and email addresses to achieve this goal efficiently.

By purchasing ten domains and setting up three email inboxes per domain, you can increase your sending capacity to 900 emails daily (10 x 3 x 30). Each email address can typically send around 30 emails daily, allowing for practical warmup tools to avoid spam complaints.

Step #2: Buy Dedicated Cold Email Domains

When purchasing dedicated cold email domains, consider selecting brand-aligned domain names to enhance email outreach effectiveness. Choosing domain names that align with your company domain and brand identity is essential for building trust with recipients.

For best results in your cold email outreach strategy, adhering to best practices in domain registration is essential. When setting up your domain for cold outreach, consider the following methods:

  1. Choose the Right TLD: Choose a domain extension, aka Top-Level Domain, that aligns with your brand reputation and identity, such as .com, .net, or .io.
  2. Utilize Similar Domains: Registering a similar domain can aid in brand association and organization of emails, enhancing the credibility of your personalized emails.

Attention to the domain and DNS settings guarantees seamless integration with your email hosting server. Investing in reputable cold email domains and aligning them with your brand can improve the success of your email campaigns.

Pro Tip: If possible, get older domains. Check the domain age; older domains tend to stand better with spam filters.

Step #3: Point Domains to Your Email Hosting Server

After securing your dedicated cold email domains aligned with your brand identity, the next step is to direct these domains to your email hosting server.

Setting up Verification and MX records in your domain registrar's DNS editor settings is mandatory to integrate the domains with your email service provider.

how to set up mx records

Proper configuration of MX records helps maintain high email deliverability, safeguard sender reputation, and ensure emails reach their intended recipients. Once you finish the setup, redirect all your cold email domains to the primary domain.

  • Domain Verification
  • Set up MX Records
  • Change Nameservers in the case of
  • Redirect Domains to Primary Business Domain

If you choose Mailforge as your email service provider, you can create email inboxes by changing nameservers.

Step #4: Set up SPF, DKIM & DKIM records

This section focuses on Google Workspace mainly cause it's the most popular email provider.

Setting up SPF, DKIM, and DMARC records is essential for cold emailing prospects, guaranteeing your domain's authenticity and credibility.

SPF (Sender Policy Framework) validates emails from authorized IP addresses, while DKIM (DomainKeys Identified Mail) adds digital signatures to prevent spoofing.

DMARC combines SPF and DKIM to fortify email security against spoofing and phishing attempts.

1. Setting up SPF


Implementing SPF for your Google Workspace (Sender Policy Framework) is essential in setting up email authentication for domain reputation and email deliverability. To set up SPF effectively, follow these steps:

  1. Open the DNS editor for your domain.
  2. Add a TXT record with a 3600 TTL with the following content: v=spf1 ~all.
  3. Repeat this process for all relevant domains associated with your email delivery infrastructure.

2. Setting up DKIM


Configuring DKIM is the next step in bolstering your email security and deliverability.

DKIM (DomainKeys Identified Mail) prevents email spoofing by attaching a digital signature to each email.

To set up DKIM, you can obtain your DKIM key from Google Workspace

  • Visit Admin Console
  • Accessing Apps > Google Workspace > Settings for Gmail > Authenticate Email and generating a new record.
  • Get the key, open your domain's DNS Records editor
  • Add it as a TXT record with a Time To Live (TTL) of 3600.

Implementing DKIM authentication enhances your email security, prevents email spoofing, and improves email deliverability.

3. Setting up DMARC


Implementing DMARC helps safeguard your domain and emails from malicious activities. It enhances email security and protects against spoofing and phishing attacks.

Here's how you can set up DMARC effectively:

  1. Access your DNS Editors to add a DMARC record.
  2. Create a new TXT record with the name _dmarc.
  3. Insert the TXT value with specific parameters like 'v=DMARC1; p=reject;,; pct=100; adkim=s; aspf=s' and a TTL of 3600.


We know setting up your Google Workspace can be a huge pain. We built Mailforge to avoid spending time on pointless technical stuff and focus more on generating sales.

Step #5: Warm up your new domain and email address

Gradually warming up your new domain and email address is key here.

Your email warm-up process is essential to establish a positive reputation with spam filters and ensure successful campaigns.

Start by sending a few emails daily to responsive contacts for about three months, gradually increasing the email sending capacity during the warm-up period. This needs to be done for each mailbox.

If you use Mailforge, then you'd never have to worry about getting blacklisted. They offer email servers that use a pool of IPs to prevent spam, a technology similar to Google Workspace emails.


And Salesforge has a built-in email warm-up system, so you don't have to worry about paying extra for tools like Lemwarm or warm-up inbox.

Compliance With Email Regulations

Moving from setting up your domain and email address to guaranteeing compliance with email regulations is critical in maintaining the integrity and legality of your cold email campaigns.

To ensure you respect email regulations and avoid email deliverability issues, consider the following:

  • Validate your emails to improve deliverability and avoid spam filters.
  • Implement DKIM & DMARC protocols to authenticate your emails.
  • Monitor your spam score regularly to prevent your emails from being marked as spam.

How to Get Started ASAP With Mailforge?

Assuming you want a sending capacity of 10,000 emails a month.

So you’d need 12 domains. 12*3 = 36 mailboxes. And 36*30 = 1080 emails sent to new prospects a day. With five emails per sequence, you’ll send 5400 emails per cold email campaign. And you can easily schedule two campaigns per month, which equates to a little over 10,000 (5400*2 = 10,800)

  1. Open up the dashboard.
  2. Use our Domain Calculator to determine your sending capacity
  3. Go to Domains ➡️ Press Auto Generate Domains ➡️ Buy 12 domains
  4. Deploy Emails
  5. Oh, there’s no step five. We just added it cause it looks cool. Mailforge is just that fast.

To Wrap It All Up

Establishing a domain and mailbox for cold email campaigns requires careful planning and attention to detail.

Following the steps outlined in this article, such as determining sending capacity, purchasing dedicated domains, setting up authentication records, and complying with regulations, can guarantee a successful cold email setup.

While Google Workspace makes everything complex, MailForge exists to relieve agency owners of the burden.


Should I Send Cold Emails from the Primary Business Domain?

Sending cold emails from the primary domain may decrease deliverability due to the risk of being marked as spam. You'd also lose the ability to do essential business communications.

Why You Should Use Separate Domains for Cold Email Outreach?

By segregating your cold email activities to a distinct domain, you can prevent any negative impact on your main domain's sender score and credibility.

This separation helps isolate potential issues that may arise from cold emailing, safeguarding the reputation of your primary business domain.

What Is a Cold Email Domain?

A cold email domain is a separate domain used solely for sending cold emails, distinct from your primary business domain.