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.