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A simple week by week plan to warm up a new cold email domain, with safe daily volumes, the rules that matter most, and when to scale.
A good cold email warm-up takes about three to four weeks. Start a new mailbox at 5 to 10 emails a day, increase gradually, and keep real cold sending under about 30 to 40 emails per mailbox per day once warmed. Do not send cold email at all in week one. Warm-up is about building a sending history, and rushing it is the fastest way to burn a new domain.
Before you start, make sure authentication is right with the free Rhycon email deliverability checker. No amount of warm-up fixes broken SPF, DKIM or DMARC.
What warm-up is
Mailbox providers score a sender by its history. A brand new domain has none, so a sudden jump to hundreds of cold emails looks like abuse. Warm-up builds a pattern of normal activity: a small number of emails to real inboxes, with opens and replies, growing slowly.
Before you warm up anything
Use a separate domain. Never cold email from your main domain. Buy a lookalike (for example, a variation of your brand name) and use that.
Set up authentication. SPF, DKIM and DMARC, plus a working MX record. See our guides to SPF, DKIM and DMARC.
Let the domain age a few days. Many teams wait one to two weeks before the first email, and a domain with some history does better.
Spread across several mailboxes. Two to three mailboxes per domain is a common ceiling.
A simple warm-up schedule
This is a conservative plan that works for most new Google Workspace or Microsoft 365 mailboxes. Numbers are per mailbox per day.
Week 1: 5 to 10 warm-up emails. No cold email.
Week 2: 10 to 20 warm-up emails. Start 5 to 10 cold emails to your cleanest, most relevant leads.
Week 3: 15 to 25 warm-up emails. 15 to 20 cold emails.
Week 4: Keep warm-up running. 25 to 35 cold emails.
After that: Hold at 30 to 40 cold emails per mailbox. If you need more volume, add mailboxes and domains instead of pushing each one harder.
Rules that matter more than the schedule
Keep bounce rate under 2 percent. Verify every list before sending. Bounces are the quickest way to damage a new domain.
Keep spam complaints well under 0.1 percent. Google says to stay below 0.1 percent and never reach 0.3 percent.
Send to people who might actually care. Relevance beats every warm-up trick.
Keep warm-up on while you send. Stopping suddenly changes your pattern.
Raise volume slowly. A jump of more than about 20 to 30 percent a week is risky.
Pause if things go wrong. If replies fall off or spam placement rises, cut volume in half and find the cause.
Does automated warm-up work?
Warm-up tools swap emails between mailboxes in a network to create opens and replies. They help a little, mainly in the first weeks, and they cannot make up for bad lists, weak copy or poor setup. Treat them as a way to build a baseline, not a fix. What really protects your reputation is sending relevant email to verified addresses and getting real replies.
Skip the manual work
Setting up and warming dozens of mailboxes by hand is a full time job. If you would rather not, Rhycon's managed infrastructure uses Rhycon-owned domains and mailboxes for your outreach, so you do not have to buy and set up your own. You can also verify any setup at any time with the checker.
Cold email warm-up FAQs
How long should I warm up a new email domain?
Three to four weeks is a safe default, and longer if you plan to send high volume.
How many cold emails per day is safe?
About 30 to 40 per mailbox once warmed. Scale by adding mailboxes and domains.
Can I warm up my main domain?
You should not cold email from your main domain at all. Use separate sending domains so any damage stays contained.
Do I need to keep warm-up on forever?
Most teams keep it running at a low level while they send. Check your provider's guidance.
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