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Most cold-email accounts get burned in the first 30 days because the setup skipped the boring infrastructure work. This walks through the right Lemlist setup — including the DNS records and inbox-rotation choices that decide whether you ever land in a primary inbox.
Who this is forFounders or sales operators standing up outbound for the first time, or anyone migrating into Lemlist from Apollo/Instantly/Smartlead. If you're planning to send 200+ cold emails per day, the setup decisions you make this week will dictate your reply rate for the next 6 months.
What you'll need
Step 1
Cold email burns sending reputation. Always use a secondary domain that mirrors your brand — e.g., yourcompany.co or get-yourcompany.com — never your primary .com.
Open Namecheap, Cloudflare Registrar, or Porkbun. Search variations of your brand: yourcompany.co, yourcompany.io, getyourcompany.com, tryyourcompany.com.
Buy 1-3 secondary domains. Each domain can host 2-3 inboxes safely. So 3 domains × 3 inboxes = 9 sending mailboxes, enough for ~200 emails/day.
Set up a 301 redirect from each secondary domain to your primary site (or to a one-page landing page). This protects brand consistency when prospects search the domain.
Do NOT skip this step and send from your primary @yourcompany.com. The day Gmail flags your cold outbound, your transactional email (password resets, invoices, support replies) gets flagged too. The blast radius is unacceptable.
Step 2
Add the four DNS records that authenticate your sending domain. Without these, Gmail and Outlook treat you as spam by default.
Open your DNS host (Cloudflare, GoDaddy, etc.) for the sending domain.
SPF (TXT record): `v=spf1 include:_spf.google.com ~all` if sending via Google Workspace. Replace with `include:spf.protection.outlook.com` for Microsoft 365.
DKIM (TXT record): generate the key inside your mailbox provider (Google Workspace Admin → Apps → Gmail → Authenticate email; Microsoft 365 → Defender → Email & Collaboration → DKIM). Paste the long TXT record into DNS.
DMARC (TXT record at `_dmarc.yourdomain.co`): start with `v=DMARC1; p=none; rua=mailto:you@yourdomain.co; pct=100`. Move to `p=quarantine` after 30 days of clean reports.
MX records: point to Google or Microsoft. This is what makes the mailbox able to *receive* email — necessary for reply detection in Lemlist.
Wait 24-48 hours for DNS propagation. Validate at mxtoolbox.com — all four records should show green.
Step 3
Provision the inbox on the sending domain. Use a real-person name (firstname@) — never generic addresses like sales@ or outreach@.
Open Google Workspace Admin (or Microsoft 365 Admin) and create a new user on the sending domain.
Naming convention: `firstname@yourdomain.co` or `firstname.lastname@yourdomain.co`. Use a real person on your team — the prospect will sometimes reply-and-google your name.
Never use sales@, outreach@, hello@, info@, or noreply@ for cold outbound. These role addresses are heavily filtered and signal automation.
Set up the inbox: profile photo, signature, basic name/title. Send 3-5 manual emails to friendly addresses (your personal Gmail, a teammate) to seed inbox interaction history.
Enable IMAP in the mailbox settings — Lemlist needs IMAP access to read replies and detect bounces.
Step 4
In Lemlist, go to Settings → Sending → Connect a mailbox. Pick Google or Microsoft OAuth. Avoid generic SMTP unless you must.
Log into Lemlist. Click your profile → Settings → Sending → Connect a mailbox.
Choose Google Workspace (OAuth) or Microsoft 365 (OAuth) — these are the cleanest connection paths and Lemlist will respect provider sending limits automatically.
Sign in with the mailbox you just created. Grant the requested permissions (read/send mail, manage labels).
Once connected, Lemlist shows the mailbox in the Sending tab with status "Active." Daily sending limit defaults to 100 emails (raise gradually after warm-up).
Repeat for each inbox you'll use. Lemlist's Inbox Rotation feature lets you spread one campaign across multiple mailboxes — critical for sending volume.
Step 5
Lemwarm is Lemlist's built-in warm-up tool. It exchanges emails with a pool of real inboxes to build sending reputation. Never skip this.
In Lemlist → Lemwarm → Connect mailbox → select the inbox you just connected.
Set initial daily volume to 10-15 emails/day. Lemwarm will gradually ramp this up over 14-21 days.
Enable both 'reply rate' and 'inbox placement' tracking. The dashboard shows what % of warm-up emails land in inbox vs spam.
Wait at least 14 days before sending any real cold campaign. Look for 95%+ inbox placement in the Lemwarm report before sending.
Keep Lemwarm running indefinitely — even after going live. It maintains reputation between sending bursts.
Step 6
Build a 3-step sequence to 20 warm leads (people who already know you). This is a verification campaign, not a real cold push.
Lemlist → Campaigns → Create campaign. Name it 'Warm verification — week 3.'
Add 20 leads from a CSV — friendly contacts, ex-coworkers, anyone who would actually open your email. This is a deliverability test, not real prospecting.
Build a 3-step sequence: Day 1 plain-text email, Day 4 follow-up, Day 8 final follow-up. No images, no tracked links, no attachments.
Send during business hours in the prospect timezone. Schedule sends Mon-Thu (avoid Friday/weekend for first run).
Watch open rate, reply rate, and bounce rate. Targets: 60%+ open, 15%+ reply, 0% bounce. If you miss these on warm contacts, something in your infrastructure is broken before you scale.
Common mistakes
Sending from your primary domain
What goes wrong: Your primary @yourcompany.com gets flagged. Now your transactional email — password resets, invoices, support, customer onboarding — also goes to spam. Recovery takes 60-90 days of professional remediation.
How to avoid: Always send cold outbound from a secondary domain that redirects to your primary site. Buy 1-3 secondary domains 14+ days before your first send.
Skipping DMARC entirely
What goes wrong: Gmail rolled out stricter DMARC enforcement in 2024. Without a DMARC record, bulk senders are now treated as suspicious by default. Open rates drop 30-50% vs. authenticated senders.
How to avoid: Add `v=DMARC1; p=none; rua=mailto:you@yourdomain.co` as a TXT record at `_dmarc.yourdomain.co`. Move to p=quarantine after 30 days of clean reports.
Skipping Lemwarm or rushing it
What goes wrong: Sending 100 cold emails/day from a fresh mailbox with zero sending history is a guaranteed spam-folder route. Inbox placement drops below 30% and the domain is functionally burned within a week.
How to avoid: Run Lemwarm for at least 14 days at 10-15 emails/day before any real cold campaign. Look for 95%+ inbox placement before sending.
Using a generic mailbox like sales@ or outreach@
What goes wrong: Role-based inboxes are filter-flagged by default at most providers. Reply rates drop 40-60% because prospects also subconsciously recognize the address as automated.
How to avoid: Use firstname@yourdomain.co. Tied to a real person on your team. Profile photo, real signature, the lot.
Connecting 5+ mailboxes at once
What goes wrong: Spam filters watch domain sending patterns. A sudden jump from 0 to 5 active mailboxes on a new domain looks like compromise or abuse. Reputation tanks across all 5.
How to avoid: Add one inbox at a time. Warm for 14 days. Then add the next. Patient ramp is the only ramp that works.
Enabling open and click tracking on day one
What goes wrong: Lemlist's click-tracking redirect URLs are flagged by some Gmail/Outlook filters. First-campaign deliverability suffers exactly when you need it most.
How to avoid: Turn off open and click tracking for the first 2 campaigns. Re-enable only after warm-up shows 95%+ inbox placement and you actually need the data.
Recap
Done — what's next
How to set up Lemwarm for domain and inbox warm-up
Read the next tutorial
Hand it off
Doing setup correctly is one project. Doing it correctly *and* keeping reputation healthy as you scale is a recurring job. A vetted demand-gen specialist on EverestX sets up new domains, warms inboxes, and manages reply triage ongoing — typically $400-1,500/mo at $14-16/hr depending on outbound volume.
See specialist rates
Technically yes, but the risk-reward is bad. The blast radius if your domain gets flagged is your entire transactional email — invoices, password resets, customer support. Even at low volume, the right answer is a secondary sending domain. The $12 cost is rounding error compared to the recovery cost.
At 30-40 sends per mailbox per day (the safe cap), you need 5-7 mailboxes. Spread across 2-3 sending domains. Lemlist's Inbox Rotation distributes one campaign across the pool automatically.
Lemwarm is good enough for most setups and is included in Lemlist Standard+. Dedicated tools like Mailreach have slightly larger warm-up pools (faster ramp) but the marginal benefit isn't worth running two tools. Use Lemwarm unless you're sending from 10+ mailboxes and need parallel warm-up speed.
21-30 days of consistent Lemwarm + light real sending (20-30/day). Increment by 10/day every 3-4 days. Watch bounce rate — anything above 3% means you ramped too fast or your list quality is poor.
All three are credible cold-outbound platforms. Lemlist leads on personalization features (dynamic images, video, LinkedIn touches in one platform). Instantly is cheaper at scale and has stronger native inbox rotation. Smartlead is the budget pick with the best per-mailbox economics. See the lemlist-vs-instantly-vs-apollo comparison for a full decision framework.
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