How Many Emails Should You Send Per Day During Email Warmup?

The single most common warmup mistake is sending too many emails too fast. Inbox providers interpret sudden volume spikes as spam - even if every individual email is legitimate. The correct answer to "how many emails per day during warmup?" depends on your domain age, sending history, and which ESP you are using. Here is the data-backed schedule from 50,000 warmed mailboxes.

The Standard Warmup Volume Schedule

For a brand-new domain or mailbox with zero sending history, this is the recommended daily warmup email volume:

• Day 1–3: 5–10 emails per day
• Day 4–7: 15–20 emails per day
• Week 2: 25–40 emails per day
• Week 3: 40–70 emails per day
• Week 4: 70–120 emails per day
• Week 5–6: 120–200 emails per day
• Week 7+: Maintain 20–30 warmup emails per day indefinitely while running campaigns

How These Numbers Change Based on Your Situation

New domain (registered in the last 30 days)

Start at the very bottom of the range above - 5 emails on day one. Brand-new domains have zero reputation with any inbox provider. Aggressive warmup on a new domain is one of the fastest ways to get permanently blacklisted. Be conservative for the first two weeks.

Aged domain (1+ years old, never used for cold email)

You can start slightly higher - 15–20 emails on day one - because the domain has organic age signals. But mailbox reputation is still at zero, so do not skip the warmup process entirely just because the domain is old.

Previously damaged domain (spam complaints or blacklisting history)

Start at the absolute minimum - 5 emails per day - and do not rush the first two weeks. A damaged domain needs to rebuild trust signals slowly. Expect 6–8 weeks before you can send meaningful cold email volume without hitting spam filters.

Gmail vs Outlook accounts

Gmail accounts can tolerate slightly faster warmup ramp-ups than Outlook. Microsoft 365 and Outlook.com are more sensitive to volume spikes, especially in the first two weeks. If warming up an Outlook account, stay at the lower end of each week's range.

What Happens If You Send Too Many

Inbox providers do not send you a warning. The consequences of over-sending during warmup are: immediate inbox placement drop (emails go to spam), domain reputation damage that takes weeks to repair, and in severe cases, blacklisting by Spamhaus or Barracuda that requires a formal delisting request.

The Rule That Overrides All Schedules

Monitor your inbox placement rate, not just your send volume. If placement drops below 85% at any point during warmup, stop increasing volume and hold at the current level until placement recovers above 90%. The schedule above assumes consistent 90%+ inbox placement. If you are not achieving that, the domain or mailbox has an underlying issue that more volume will only make worse.

MailPilot monitors inbox placement in real time across Gmail, Outlook, and Yahoo - so you know immediately when to hold volume and when it is safe to scale.