Domain warmup

Are pre-warmed domains worth it?

Pre-warmed domains, aged domains and warmed-up Gmail and Outlook accounts are sold on the promise that the waiting has been done for you. This page is what is actually being sold, what transfers with a domain or an account and what does not, what Google's own rules say, what we see happen to bought consumer accounts once they start sending, and the alternative that takes 21 days and leaves you owning the history.

By Published Updated 8 min read

What is being sold

  • Pre-warmed domains: a domain registered by the seller, with mailboxes that sent warming mail for a period, transferred to you. Sequencer marketplaces sell them provisioned through partners, priced per domain per year and per mailbox per month; Smartlead's pricing page lists pre-warmed Outlook and Google mailboxes this way (read 2026-09-06).
  • Aged domains: domains registered years ago, sold on the age alone. The age is real and public; the history is neither.
  • Warmed-up Gmail and Outlook accounts: consumer accounts created and warmed in bulk, sold as ready for outreach.

What transfers, and what does not

A receiver's trust in a sender is a record of what that sender's mail did: who opened it, replied, kept it, reported it. The record is keyed to the domain and the mailbox, so in a narrow sense it transfers with them. What does not transfer is what made it: the seller's content, the seller's infrastructure, the seller's recipients. The day you connect the account to your sending platform, put your list behind it and send your message, the receivers are scoring a new pattern on an old key, and they update fast. What you have bought is the registration date and a head start measured in days, plus whatever the previous holder did with it.

Age, at least, is verifiable: the domain reputation checker reads the registration date from RDAP alongside the blacklist listings and the records, which is the minimum to run on any domain before paying for it.

Google's rules, in Google's words

Gmail's Program Policies say: “Don't use Gmail to distribute spam or unsolicited commercial mail”, and “You are not allowed to automate the Gmail interface, whether to send, delete, or filter emails, in a manner that misleads or deceives users.” A consumer Gmail account's limit is 500 messages/day, and Google Workspace on trial is limited to 500 messages/day and 500 unique external recipients/day, per Google's limits pages. None of that is about warming; all of it is about what a bought account is bought to do.

What we see happen to bought consumer accounts

Consumer @gmail.com accounts connected to MailStrike and used for outreach are locked or disconnected by Google, in our experience within days of the first real sends, regardless of how they were warmed. The study below is the measured version: the cumulative share disconnected by each day after connection, against Google Workspace mailboxes over the same window.

A bought Workspace or Microsoft 365 mailbox is not disconnected the way a consumer account is; it is simply a new sender to the receivers within days, on a domain whose history you cannot read. The risk is not the lock; it is paying for a head start that does not exist.

The alternative: 21 days you own

  1. 1

    Register the domain yourself

    A name that reads as yours, separate from the company's main domain. Check it in the reputation checker before you buy the name; a dropped domain can carry a listing.

  2. 2

    Create the mailboxes on Workspace or Microsoft 365

    Business accounts on your own domain, a few per domain, connected over OAuth.

  3. 3

    Publish the records

    SPF, DKIM and aligned DMARC; the generators write them and the auth checker confirms them.

  4. 4

    Warm for 21 days

    An AI Agent on each mailbox in real threads across the MailStrike network, on a ramp, before the first cold email. At full volume by day 21, with warming continuing after.

  5. 5

    Send at 20 to 30 a day per mailbox

    Scale with placement, add mailboxes for volume, and test placement before each step up.

New domain warmup is the 21 days as a calendar; Gmail warmup covers what happens when a consumer account is warmed anyway.

Sources

Every claim above that rests on a third party links to that party's own page. Checked . If something has changed since, tell us and we will correct it.

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