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Glossary

Warm-up

Warm-up is the practice of starting with a low sending volume and raising it step by step, so mailbox providers see a steady pattern rather than a sudden burst.

Updated · By Otman Ounana · How we research

Why it matters when you send from your own Gmail

Google's own advice is to start with a low sending volume to engaged users and slowly increase it.[1] Inside Honest Intros this is built in: a mailbox starts at 20 emails a day and rises by 10 each sending day to a ceiling of 50, and a personal Gmail address stays at 20. Warm-up here means a ramp on real emails, not mail exchanged with other tools to look busy.

Example

Day one: 20 emails. Day two: 30. Day three: 40. From day four: 50 at most. If bounces appear, the cap is halved and climbs back as clean days pass.

What to do

Stay under the daily cap even if the first days go well, and send on working days. If you stop for a week or two, restart lower than where you left off.

Related terms

All terms are on the glossary.

Read next

  • Warm up the inbox you already useWarming up an existing Gmail or Workspace mailbox for cold email: what Google advises, a day-by-day schedule from 20 to 50 a day, and when to slow down.
  • Can cold email get Gmail suspended?When Google pauses or suspends sending from a Gmail or Workspace account, for how long, and the habits that keep a mailbox used for cold email safe. Quoted from Google.
  • Postmaster ToolsPostmaster Tools is a free Google service that shows a domain's owner how Gmail sees the mail it sends, including the rate at which recipients mark it as spam.
  • Soft bounceA soft bounce is a temporary delivery failure, such as a full mailbox or a busy server, reported with a 4xx status code or as a delayed delivery.

Sources

  1. Google, Email sender guidelines. “Start with a low sending volume to engaged users, and slowly increase the volume over time.” Read on 1 October 2026.