From buying domains to first send with nothing assumed.
Your cold email infrastructure is the foundation that everything else sits on. The best email copy in the world cannot overcome broken infrastructure. DNS authentication, sending accounts, domain selection, and warmup all need to be set up correctly before your first campaign goes out. This guide covers the complete email infrastructure setup process from scratch, assuming you are starting with nothing and need to be ready to send within a few weeks.
The difference between shared and dedicated infrastructure is the most fundamental choice you will make. Shared infrastructure means your emails route through servers used by other senders. Dedicated infrastructure means you send through your own accounts and servers. With shared infrastructure, another sender's poor behavior can damage your deliverability. With dedicated infrastructure, your reputation depends only on your own sending patterns. This guide focuses on setting up your own dedicated cold email sending setup because it gives you the most control over deliverability.
Never use your primary business domain for cold email. Register separate domains that are similar to your main domain. If your company is acme.com, register variations like acme.co, tryacme.com, or acmemail.com. Buy two to three domains to start so you can distribute sending across them. Choose domains from reputable registrars and avoid domains that have been previously owned, as they may carry existing reputation baggage. Set up a simple landing page on each domain that redirects to your main website so recipients who visit the domain see something legitimate.
Each sending domain needs three DNS records: SPF, DKIM, and DMARC. SPF is a TXT record that lists which servers can send email for the domain. DKIM adds a cryptographic signature to verify email integrity. DMARC sets the policy for what happens when authentication fails. All three must be configured before you create any mailboxes or start warmup. The specific records depend on your email provider. For Google Workspace, include _spf.google.com in your SPF. For Amazon SES, include amazonses.com. DKIM records are generated by your provider during setup.
Set up mailboxes on your sending domains through an email provider like Google Workspace, Microsoft 365, or Zoho. Create two to three mailboxes per domain using real sounding names like sarah@tryacme.com or james@acmemail.com. Fill in the profile information for each account, including a real name and profile photo. These details appear in email headers and help your messages look legitimate to both spam filters and recipients. Plan for 30 to 50 cold emails per mailbox per day as a safe maximum volume.
If you want to scale beyond what individual mailboxes can handle, add Amazon SES as a sending provider. Verify your domains in the SES console, add the DKIM CNAME records to DNS, configure SPF, and request production access. SES charges $0.10 per 1,000 emails, which is significantly cheaper than per mailbox email providers at higher volumes. You can use SES alongside Gmail and Outlook accounts, rotating between providers to distribute volume.
Enable warmup on every new mailbox immediately after creation. Start with 5 to 10 warmup emails per day and increase gradually over two to four weeks. Do not skip this step even if your domains are aged and your DNS is perfect. New mailboxes have no sending history, and warmup before sending is what builds the trust needed for your cold emails to reach the inbox. Monitor inbox placement during warmup to confirm your infrastructure is working correctly before you start real campaigns.
Once your domains are configured, mailboxes are created, DNS is verified, and warmup has been running for at least two weeks, connect your sending accounts to your cold email platform. Configure sender rotation so campaigns distribute emails across multiple accounts and domains. This spreads volume evenly and prevents any single account from hitting provider limits. Test each connection with a small batch of emails before launching full campaigns.
Infrastructure is not a set and forget operation. Check your DNS records weekly to make sure nothing has changed or been accidentally deleted. Monitor your sending domains against major blacklists. Track bounce rates per account and per domain. Watch for sudden drops in open rates, which often indicate a deliverability problem at the infrastructure level. Set up Google Postmaster Tools for any domains that send to Gmail recipients to get direct visibility into how Google classifies your sender reputation.
Putting all your sending volume through a single domain is a risk that many senders take early on. If that domain gets blacklisted, your entire outreach infrastructure goes down. Distributing across two to three domains means a problem with one does not stop your campaigns entirely.
Using free email accounts like personal Gmail for cold outreach is another common mistake. Free accounts have stricter sending limits and are more likely to be suspended for outreach activity. Use business email through Google Workspace, Microsoft 365, or Zoho, which are designed for professional email volume.
Skipping the landing page on sending domains leaves a gap that spam filters notice. A domain with no website, no SSL certificate, and no web presence looks like it was created solely for sending email, which is a negative signal. Even a simple one page site with your company information makes a meaningful difference in how email providers evaluate the domain.
EmailQo connects to Gmail, Outlook, Zoho, and Amazon SES as sending providers. You bring your own outreach infrastructure, and EmailQo handles campaign management, sender rotation, follow up sequences, and reply detection. Built in warmup is included on every plan, and pre send inbox health checks validate your DNS records, scan for spam triggers, and check blacklists before each send. This means your infrastructure is continuously monitored as part of your normal campaign workflow.