Every major email provider caps how many messages an account can send in a day, and the cap depends heavily on your account type. Hitting that limit unexpectedly — mid-newsletter or mid-invoice run — can be frustrating, so it's worth knowing your numbers before you need them.
Sending Limits at a Glance
| Account Type | Daily Sending Limit | Recipients Per Message |
|---|---|---|
| Free Gmail (browser) | 500 emails/day | 500 recipients |
| Free Gmail (via SMTP) | 500 emails/day | 100 recipients |
| Google Workspace (paid) | 2,000 emails/day | 2,000 recipients (100 per SMTP relay transaction) |
| Google Workspace (trial) | 500 emails/day | 2,000 recipients |
| Outlook.com (free) | ~300 recipients/day | 100 recipients/message |
| Microsoft 365 / Exchange Online | 10,000 recipients/day/user | 500/message (admin can raise to 1,000) |
Gmail Limits in Detail
Free Gmail accounts can send up to 500 messages within a rolling 24-hour window. When sending through the Gmail web interface, each message can include up to 500 recipients; when sending via SMTP (through a third-party client or app), the per-message recipient cap drops to 100 — though your overall daily total of 500 stays the same either way.
Google Workspace paid accounts raise the daily limit to 2,000 messages, with up to 1,500 per day specifically for mail merge sends, and up to 10,000 recipients per day if sending through Workspace's SMTP relay service (capped at 100 recipients per individual SMTP transaction).
Outlook Limits in Detail
Free Outlook.com accounts allow roughly 300 unique recipients per day for established accounts, with a maximum of 100 recipients per message. New accounts often start much lower — sometimes as few as 10 to 100 per day — with limits increasing gradually as Microsoft's reputation-based system builds trust in the account.
Microsoft 365 (Exchange Online) business plans — including Business Basic, Standard, Premium, and Enterprise tiers — share the same core limits: 10,000 recipients per day per user, 500 recipients per message (an admin can raise this to 1,000), and 30 messages per minute. There is no separate, higher tier for Enterprise plans.
In 2025, Microsoft also introduced a tenant-wide limit called the Tenant External Recipient Rate Limit (TERRL), which caps an entire organization's external sends per day across all users combined — separate from the per-user limit above. Trial organizations are capped at 5,000 external recipients per day under TERRL; paid tenants scale with license count. If your organization runs coordinated outreach, this org-wide cap can be more restrictive than any single user's limit, so check with your Microsoft 365 admin for your organization's specific figure.
What Happens If You Exceed Your Limit
For free Gmail, exceeding the daily limit typically results in a roughly 24-hour block on outgoing mail. For Outlook.com, the block can last 24 to 48 hours. For Microsoft 365 and Google Workspace accounts, messages sent above the limit generally queue or bounce until the rolling window resets. Beyond the temporary block, repeated overages can damage your sender reputation, which can lead to longer-term throttling even after the block lifts.
Staying Within Safe Limits
- Spread sending across the day rather than sending everything in one burst — providers monitor sending patterns, not just totals.
- If you regularly approach your limit, consider whether a paid plan with a higher cap (Google Workspace or Microsoft 365) fits your needs better than a free account.
- For new mailboxes or domains, start with lower volume and increase gradually rather than sending at full capacity right away.
Frequently Asked Questions
Does upgrading from free Gmail to Google Workspace increase my sending limit?
Yes — it raises your daily cap from 500 to 2,000 messages.
Is the 500,000-recipients-per-day figure for Microsoft 365 accurate?
No — that figure has no basis in Microsoft's official documentation. All Exchange Online plans, including Enterprise tiers, are capped at 10,000 recipients per day per user.
What's the difference between a per-day limit and TERRL?
The daily limit applies per individual user; TERRL is a separate, organization-wide cap on total external recipients across every user in the tenant combined.
