How many emails per day can you safely send?

Safe sending volumes vary based on reputation, infrastructure, and engagement quality. There's no universal number.

General guidelines:

• New domains (first month): 20 to 50 emails daily maximum
• Warming domains (months 2 to 3): 50 to 100 emails daily

Established domains with good reputation: 100 to 200+ emails daily, depending on engagement

Factors that affect safe volume:

• Domain age and history
• Engagement rates (opens, replies)
• Complaint rates (spam reports)
• Bounce rates
• Content quality and consistency

Per-mailbox considerations:

• Google Workspace accounts: Generally 100 to 150 daily for newer accounts
• Microsoft 365: Similar ranges with its own limits
• Custom SMTP: Depends on provider policies

Warning signs you're sending too much:

• Rate limit errors (421 responses)
• Increasing spam folder placement
• Postmaster Tools reputation declining
• Bounce rates increasing

Volume should follow engagement quality. High volume with poor engagement accelerates reputation damage.