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Sending volume: how much is too much?
Here's how many emails you can send out safely without hurting your deliverability.
Frank Sondors
February 06, 2025
I’m sure you’ve asked yourself: how many emails can I send per day without hurting my deliverability?
The truth is, there’s no universal answer—it depends on your email infrastructure, sending reputation, and email service provider (ESP) limits.
Let’s break it down so you can scale safely without ending up in the spam folder.
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Understand ESP’s sending limits
Different email providers impose different daily and hourly sending limits to prevent spam. Here’s a quick reference:
Email Provider | Daily Sending Limit | Hourly Limit | Recipient Limit Per Email |
|---|---|---|---|
Gmail (Free) | 500 emails | 20 emails/hour | 100 recipients |
Google Workspace | 2,000 emails | 100 emails/hour | 500 recipients |
Outlook | 5,000 emails | 300 emails/hour | 500 recipients |
Zoho Mail | 500 emails (paid plan) | Not specified | Not specified |
🔹 With dedicated cold email infrastructure like Mailforge or Infraforge the sending limits are more scalable - you can add domains and mailboxes at any time to scale your outreach, without drastically increasing the cost.
Join our Weekly Huddle to ask questions, tackle email campaign challenges, and brainstorm solutions with peers - all in one interactive session.
The importance of warm up
If you start sending hundreds or thousands of emails from a new or inactive email account, email providers will flag you as spammy. Instead, follow a warm-up process or use a tool like Warmforge to do it on autopilot.
We recommend the initial warm up period to last 2-4 weeks. During that time start ramping up from 4 emails per day to 20 with a 30%-50% reply rate. Warm up has to be on for the lifetime of the account.
Aim for 50 emails total capacity per mailbox where 20 are dedicated to warm up and 30 to cold email.
Avoid these infrastructure mistakes:
What to do if you’re facing issues:
❌ Problem: Emails Landing in Spam
Mass cold emails often end up in the spam folder due to poor email infrastructure, missing authentication records (SPF, DKIM, DMARC), or sending from a new, unwarmed domain. Email providers flag unknown senders or bulk-sending behavior as suspicious.
✅ How to Fix It:
Set up SPF, DKIM, and DMARC to authenticate emails.
Use a dedicated sending domain (e.g.,
sales.yourcompany.com) instead of your primary domain.Warm up your email account gradually instead of sending hundreds of emails from day one.
❌ Problem: High Bounce Rates
Sending to unverified, outdated, or purchased email lists results in bounces, which lowers sender reputation and increases the risk of being blocked.
✅ How to Fix It:
Use an email verification tool before sending to remove invalid addresses.
Regularly clean your email list to maintain a high-quality database.
Monitor bounce rates (keep them under 2%) to prevent ESPs from flagging your account.
❌ Problem: Spam Complaints & Blacklisting
If recipients mark your emails as spam, your domain and IP address can be blacklisted, causing future emails to be blocked automatically.
✅ How to Fix It:
Provide a clear and easy opt-out option to comply with CAN-SPAM & GDPR regulations.
Avoid spammy words like "free," "guaranteed," or "limited-time offer."
Monitor your domain reputation using Salesforge’s Mailbox Reputation Score & IP & Domain Blacklist Checker.
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