Deliverability
Warming up an email domain means sending a small, rising volume of real-looking email from a new inbox for two to three weeks so mailbox providers learn it's legitimate before it carries cold volume. Set up SPF, DKIM and DMARC first, start at 5 to 10 emails a day, add a few each day, keep warmup running at a low level after launch, and never let a new inbox send more than about 30 to 50 cold emails a day. The full schedule is below.
Gmail, Outlook and Yahoo score every sending domain and IP on history. A brand-new domain has none, so the first emails it sends are treated with suspicion, and a burst of cold email from it looks exactly like spam. Warmup builds that history on purpose: a small number of emails a day to inboxes that open them, reply to them and pull them out of spam, rising steadily until the domain has a track record.
Warmup can't fix a bad list or a bad email. It buys you a fair hearing.
Skip any of these and the warmup is wasted.
p=none is the minimum. Record syntax, alignment, and the test are in the SPF, DKIM and DMARC setup guide.| Days | Warmup emails a day | Cold emails a day | What to watch |
|---|---|---|---|
| 1 to 3 | 5 to 10 | 0 | Authentication passing on every send |
| 4 to 7 | 10 to 20 | 0 | Spam placement in the warmup network, should be falling |
| 8 to 14 | 20 to 35 | 0 to 10 | Bounces on any test sends, blocklists |
| 15 to 21 | 30 to 40 | 10 to 25 | Reply rate on the first real sends |
| 22 onward | 15 to 25 (keep it on) | 25 to 50 | Daily DNS, blocklist and complaint checks |
Two things people get wrong. First, they switch warmup off at launch. Keep it running at a lower level for as long as the inbox sends cold email. Second, they treat the cold email ceiling as a target. Hunter's 2025 data found inboxes sending 20 to 49 emails a day replied at 5.7%, above average, while exceeding 100 a day damaged deliverability. When you need more reach, add inboxes and domains rather than pushing one harder. Read how many cold emails to send per day for the full math.
Every major cold email platform includes a warmup network: Saleshandy, Instantly and Smartlead all do. They exchange emails between customer inboxes, open them, reply and rescue them from spam. In our programs Saleshandy's warmup has been the most reliable of the three, which is one reason it's our default for new domains. The tool matters less than the discipline of leaving it on.
A domain is ready for real volume when all four are true: three weeks of history, spam placement in the warmup network under about 5%, authentication passing on every send, and a small batch of real cold emails that produced replies without bounces or complaints. If any one is missing, give it another week. A week of patience costs less than a burned domain.
At Be Leaded every new inbox follows this schedule before it touches a client campaign, and warmup stays on for the life of the inbox. It's part of why our programs hold a 99% delivery rate.
Two to three weeks before a new inbox sends real cold email, and it keeps running at a lower level afterward. Domains bought a few weeks before warmup starts tend to get through it more smoothly.
Start at 5 to 10 a day and rise to 30 to 40 by the third week. After launch, keep warmup at 15 to 25 a day alongside cold sends.
You can, but you shouldn't send cold email from it. If the domain's reputation drops, every invoice, support reply and internal email your company sends suffers. Use separate sending domains. If a vendor will set up the domains for you, what to ask before hiring a cold email agency covers the domain questions.
No. Keep it on at a lower level for as long as the inbox sends cold email. Reputation is earned continuously.
Yes, and the same schedule applies. Hunter's data shows Google Workspace inboxes replying at 5.9% against 4% or more for Microsoft 365, so many programs run both and let the results decide the mix.
The safe number of cold emails per inbox per day, how many inboxes per domain, and a worked example for reaching 3,000 or 25,000 prospects a month without losing the inbox.
See the daily limitsWhat Gmail, Yahoo and Outlook require from senders in 2026: SPF, DKIM and DMARC, spam complaint rates, one-click unsubscribe, enforcement dates, and how to set up cold email so it reaches the inbox.
Read the requirementsTwelve cold email templates we use in client campaigns, with the reasoning behind each one: the trigger email, the question email, the referral ask, the breakup and more. Under 80 words, one ask, no fluff.
Read the templatesThirty minutes with the founder. You'll leave with a clear picture of your market, what a campaign would look like and what it would cost.
Or email sales@beleaded.com