Outreachly recommends sending no more than 40–50 emails per mailbox daily to maintain a strong sender reputation and ensure high deliverability rates.
This guideline is based on email deliverability best practices and ensures that your emails reach the inbox, not the spam folder.
Why Limit to 40–50 Emails Per Mailbox Per Day?
1. Protect Your Domain Reputation
Sending too many emails quickly can raise red flags with email service providers (ESPs). When ESPs detect sudden surges or unusually high volumes from a single mailbox, they may mark emails as spam or block delivery entirely. Keeping your volume between 40 and 50 emails daily demonstrates organic and healthy email behavior, safeguarding your domain reputation.
2. Improve Deliverability Rates
A gradual, controlled email volume ensures more emails reach your prospects' inboxes. Excessive sending without proper warm-up or volume management can lead to emails landing in spam folders. Outreachly’s Managed Domain & Email Service and Email Warm-Up Service are designed to help you maintain strong deliverability.
3. Minimize the Risk of Email Blacklisting
If your mailbox sends hundreds of cold emails without a proper sending limit, your IP address or domain may be flagged or blacklisted by providers such as Gmail or Outlook. A daily limit of 40–50 emails per mailbox keeps your sending behavior consistent and safe.
4. Align with Warm-Up Protocols
Outreachly’s Email Warm-Up Service gradually increases your email volume, allowing email providers to recognize your domain as trustworthy. Sticking to a 40–50 email-per-day limit aligns with the safe sending volumes established during the warm-up process.
Example: Scaling Your Outreach Safely
1 Mailbox: 40–50 emails/day → Up to 1,500 emails/month
5 Mailboxes: 200–250 emails/day → Up to 7,500 emails/month
10 Mailboxes: 400–500 emails/day → Up to 15,000 emails/month
Using multiple mailboxes helps scale your outreach without risking the health of any single mailbox. Outreachly’s Managed Domain & Email Service allows you to easily add new mailboxes to expand your campaigns while staying compliant with sending limits.
💡 To learn more about our Managed Domain & Email Service - click here
Best Practices to Maintain Email Health:
✅ Use Warm-Up Services: Maintain a healthy sending pattern with Outreachly’s automated warm-up solutions.
💡 To learn more about our Email Warmup Service - click here
✅ Personalize Emails: Keep your email copy short, personalized, and relevant to increase engagement.
✅ Monitor Engagement Rates: Use Outreachly’s analytics to track open rates and adjust your strategy accordingly.
❌ Avoid Sudden Spikes: Increase your sending volume gradually, especially with new domains.
❌ Don't Rely on a Single Mailbox: Use multiple mailboxes to scale safely.
🚀 Success! Sticking to 40–50 emails per day per mailbox is the key to higher deliverability, a strong sender reputation, and more replies—helping you scale your outreach safely with Outreachly.