What are safe daily sending limits for cold email?
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A lot of cold emailers ask "how many emails can I send per day?" when the real question is "how many can I send without burning my domain?" Those are very different numbers.
The limits below are conservative on purpose. Your domain's reputation is the asset you're protecting. Build it slowly and you can scale. Rush it and you'll spend weeks recovering.
Recommended daily sending limits by domain stage:
- New domain (weeks 1 to 2): 10 to 30 emails per day. No exceptions. New domains have zero reputation history, and mailbox providers are watching closely.
- Warming domain (weeks 3 to 6): 30 to 75 emails per day. Increase only if your engagement looks healthy (more on that below).
- Established domain with solid reputation: 75 to 150 emails per day. This is a ceiling for most cold outreach, not a target.
If you're sending from multiple inboxes on one domain, these limits apply across the whole domain, not per inbox. Splitting 200 emails across four inboxes doesn't fool anyone.
What about provider technical limits?
Google Workspace allows up to 2,000 emails per user per day. Microsoft 365 allows up to 10,000 per account per day. These are technical maximums, not safe operating zones. Hitting either of those numbers with cold email would crater your domain reputation fast.
What "engagement" actually means here:
For cold email, engagement is mostly about replies and non-bounces. Opens are unreliable thanks to Apple Mail Privacy Protection and proxy opens. What you actually want to watch is your reply rate, your hard bounce rate, and whether recipients are marking your messages as spam. A reply rate above 5% is a healthy sign. A hard bounce rate above 2% is a warning. Any spam complaints at all should make you pause and reassess your list quality.
Signs you're sending too much too soon:
- Rate-limiting errors from your sending provider
- Emails landing in spam that previously hit the inbox
- Declining domain reputation scores in Gmail's Postmaster Tools
- Hard bounce rate climbing above 2%
Still if you see any of these, pull back immediately. Don't try to push through. Drop your daily volume by half and give your domain a few days to recover before increasing again.
Volume should follow your reputation, not your pipeline goals. The senders who scale cold email successfully are almost always the ones who went slower at the start. Want to check where your domain reputation stands right now? Our free blocklist checker is a quick first look, and if something looks off, the SOS hotline is free.
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