Inboxlogy Free Tools
Email Warm-Up Calculator
Plan a safe ramp-up for new mailboxes — enter your targets and get a day-by-day sending schedule that builds reputation without tripping spam filters.
How it works
Enter mailbox details
Tell the tool how many mailboxes you're warming, the date you started, and the daily send volume you eventually want each inbox to carry. Defaults are conservative.
Get your ramp curve
The calculator returns a day-by-day schedule: how many emails to send per mailbox each day, how long the ramp takes, and the total capacity you reach at the end.
Cap and adjust weekly
Load the schedule into your sending tool as a hard daily cap. Check bounce and reply rates every week. If bounces climb above one percent, hold volume flat until they settle.
Why mailbox reputation has to be earned gradually
Mailbox providers score the sending domain and IP behind every message. A brand-new domain has no history, so filters treat it as unknown and watch how recipients react. Volume that jumps from zero to hundreds of sends a day looks automated, because it is. A gradual ramp gives providers a longer window of normal-looking behavior to measure, and it limits the damage if your list or copy turns out to be bad.
The signals that matter are engagement signals. Replies, opens from real devices, messages dragged out of spam, and recipients adding you to their contacts all count in your favor. Hard bounces, spam complaints, and mail deleted unread count against you. Google and Microsoft do not publish their weights, so treat any ramp number as a safe default, not a law.
Common mistakes
Warming without authentication in place
SPF, DKIM, and DMARC need to be live before the first send. Warming an unauthenticated domain teaches providers nothing useful, and the mail gets filtered no matter how slowly you ramp. Managed mailbox providers, Inboxlogy included, set these records at provisioning.
Ramping into an unverified list
A clean ramp cannot survive a dirty list. Verify every address before it enters the schedule. Hard bounces during warm-up do more damage than at any other time, because providers have no positive history to weigh them against.
Treating the schedule as finished
Hitting your target volume is not the end of warm-up. Reputation decays when sending stops and resets when you change domains. Keep volume steady, and re-ramp any mailbox that has been idle for a few weeks.
Faking engagement with warm-up pools
Automated inbox networks that open and reply to each other produce engagement from accounts that never buy anything. Providers can spot the pattern, and it hides the real problem: copy that nobody answers.
Frequently asked questions
How long does it take to warm up a new email account?
Plan on three to four weeks before a new mailbox carries a steady production load. Start in the single digits per day and add a few sends daily, holding flat whenever bounces or complaints rise. Domains with existing mail history warm faster, and a brand-new domain should sit for two weeks first.
How many cold emails can I send per mailbox per day?
Most teams settle between 20 and 50 cold sends per mailbox per day once warm. The ceiling is not a provider limit, it is a risk limit: fewer sends per mailbox means less damage if one domain gets flagged. Scale by adding mailboxes and domains, not by pushing a single inbox harder.
Do I need a warm-up tool, or is a schedule enough?
A schedule plus a hard daily cap in your sending platform covers most of it. Warm-up tools mainly automate artificial opens and replies between member inboxes, which is engagement from people who will never reply to a real offer. Real conversations with prospects, customers, and colleagues are better warm-up traffic.
What bounce rate should make me pause my warm-up?
Hold volume flat above one percent hard bounces, and investigate above two percent. Complaints matter more than bounces. Google's bulk sender guidelines ask senders to keep reported spam below 0.1 percent and never reach 0.3 percent, so a rising complaint rate means pause the campaign, not slow it. Check both weekly while you ramp.
Can I warm up several mailboxes on the same domain at once?
Yes, but the domain-level volume adds up, so ramp the domain and not just each inbox. Three mailboxes each sending 30 a day is 90 sends from one domain. Spread cold volume across several sending domains that redirect to your main site, and keep your primary domain out of cold campaigns.