TL;DR
- Free Gmail: 500 recipients/day (browser or SMTP, shared pool)
- Google Workspace: 2,000 emails/day per user
- Microsoft 365 (Exchange Online): 10,000 recipients/day, 30 messages/minute;
- Published limits are ceilings — behavioral enforcement means accounts can be blocked well below the official number
- Woodpecker monitors your sending pace automatically and pauses campaigns before you hit provider limits
You have to know this. Especially if you do email outreach. Each email service provider has its own email sending limits. The limits may be daily, hourly, and sometimes also per minute. If you’re sending cold email campaigns to hundreds of email addresses, without being aware of your email provider’s sending limits, your email account may get blocked before you know it.
In this blog post, you will find information about:
- how many emails can Gmail send per day,
- how many emails can you send at once with Yahoo,
- how many emails can Outlook.com send at a time,
- what are email sending limits of some other popular email hosts,
- how many emails are considered spam and how to avoid getting blacklisted.
If you’re looking for an answer to any of the above questions, you came to the right place.
Why email sending limits matter for outreach in 2026
Email sending limits are the maximum number of emails — or recipients — an email provider allows a single account to send within a defined time window, typically a rolling 24-hour period. Exceed them and your account gets blocked, your emails bounce or your sender reputation takes a hit that follows you for weeks.
If you send cold email campaigns using a tool like Woodpecker — which sends from your own mailbox via your own SMTP — it is your email provider’s limits that govern how many emails can actually go out, not Woodpecker’s platform limits. Understanding the distinction between your provider’s published limit and the practical safe sending threshold for cold outreach is the most important thing you can take from this page.
Two things have changed in 2026 that make this more important than before:
- Rolling 24-hour windows, not calendar days. Every major provider now applies limits on a rolling basis. If you send 500 emails at 3 PM, your limit resets at 3 PM the next day — not at midnight. Many senders discover this the hard way when they try to send campaigns on consecutive mornings.
- Behavioral enforcement sits below published limits. Gmail enforces behavioral heuristics on top of published quotas — accounts have been blocked even at 12–28 emails on a bad day, well below the 2,000/day Workspace ceiling. The published limit is the maximum. The actual threshold where Gmail or Outlook starts filtering depends on your domain age, bounce rate, spam complaint rate and sending pattern. For cold email outreach, the practical safe limit is significantly lower than the published one.
Email sending limits of various email providers: comparison table
Here’s the cleaned-up table with only the providers that have descriptions:
- Free Gmail
Sending limit: 500 recipients per day
Rolling window: Yes
Safe outreach volume: 20–40 emails per day - Google Workspace
Sending limit: 2,000 recipients per day
Rolling window: Yes
Safe outreach volume: 100–150 emails per day - Microsoft 365 / Exchange Online
Sending limit: 10,000 recipients per day
Rolling window: Yes
Safe outreach volume: 200–500 emails per day - Outlook.com
Sending limit: 5,000 recipients per day
Rolling window: Yes
Safe outreach volume: Up to 1,000 new contacts per day - GoDaddy Workspace
Sending limit: 1,000 recipients per message
Rolling window: Yes
Safe outreach volume: 100–150 emails per day - Rackspace
Sending limit: 10,000 recipients per day
Rolling window: Yes
Safe outreach volume: Depends on account and message quality - BlueHost
Sending limit: 150 emails per hour
Rolling window: Yes
Safe outreach volume: 50–100 emails per day - DreamHost
Sending limit: 100 recipients per hour
Rolling window: Yes
Safe outreach volume: 50 emails per day - Yahoo Mail
Sending limit: Estimated at approximately 100 emails per hour
Rolling window: Yes
Safe outreach volume: Not recommended for outreach - Yandex Mail
Sending limit: 1,000 recipients per day through the browser
Rolling window: Yes
Safe outreach volume: Not recommended for outreach - HostGator
Sending limit: 500 emails per hour per domain
Rolling window: Yes
Safe outreach volume: Depends on account and message quality
Sources: prospeo.io, prospeo.io, growthlist.co, learn.microsoft.com
Note: Free Gmail SMTP and browser sends share the same 500/day recipient pool. The 100 figure is a per-message cap via SMTP, not a separate daily limit.
Free Gmail account email sending limit
Daily limit: 500 recipients per rolling 24-hour window, whether sending via browser or SMTP. Gmail counts recipients, not messages — sending one email to 10 people uses 10 of your 500 daily slots.
Per SMTP message: ~100 emails/day. Via browser, up to 500 recipients per message.
Rolling window: Yes — limits reset 24 hours after the first email of the day, not at midnight.
What happens if you exceed it: Your account is blocked from sending for 1–24 hours. You can still receive emails and access your account. Repeat violations lead to longer suspensions and can permanently damage your domain reputation.
Additional context for 2026: Gmail does not have official hourly limits — you are only limited by the 500 daily cap on free accounts. But behavioral heuristics mean sending 20+ emails at once significantly increases your chance of triggering spam filters. Free Gmail is not suitable for cold email campaigns. If you are doing any volume of outreach, use a Google Workspace account on a custom domain — both for deliverability reasons and because recipients treat emails from @gmail.com addresses with less credibility than those from business domains.
Tip: Before you run your next campaign, check 14 Deliverability Checks before your cold email campaign — a complete pre-send audit
Google Workspace email sending limit
Daily limit: 2,000 recipients per day / 10,000 through the relay server
Per hour: No official hourly limit
Hidden cap for mail merge: Workspace mail merge is capped at 1,500 emails per day even on paid plans — lower than the standard 2,000 email daily limit. If your outreach tool uses mail merge functionality, this is the effective ceiling.
Trial accounts: 500 emails/day — increases only after your domain has cumulatively paid at least $100 USD and at least 60 days have passed since that threshold
Rolling window: Yes — limits apply over a rolling 24-hour period. If you send 2,000 emails at 3 PM today, your limit resets at 3 PM tomorrow, not at midnight.
2026 update: As of February 2026, Google increased attachment max size limits to 50 MB (send) and 70 MB (receive) for Enterprise Plus accounts, configurable by admins. Standard Workspace accounts retain the 25 MB attachment limit.
What the 2,000 limit actually means for cold outreach:
The published 2,000/day limit is not your safe sending ceiling. Gmail tracks the number of unique recipients you contact in each 24-hour window and how that changes over time. Gradual increases are interpreted as normal mailbox use. Sudden spikes increase filtering sensitivity. A safe warm-up pattern for a new Workspace account looks like this:
- Week 1
Safe daily send volume: 20–30 emails per day - Week 2
Safe daily send volume: 40–60 emails per day - Week 3
Safe daily send volume: 70–100 emails per day - Month 2 and beyond
Safe daily send volume: 100–150 emails per day at a steady rate
Jumping from 0 to 200 emails/day overnight is how accounts get restricted before a campaign even gets going.
What happens if you exceed it: Account blocked from sending for up to 24 hours. Repeated violations lead to progressively longer suspensions and domain reputation damage that persists beyond the lockout period.
Learn more: Gmail sending limits in Google Workspace — Google Admin Help
Microsoft Office 365
Daily recipient limit: 10,000 recipients per rolling 24-hour period
Per message: 500 recipients maximum per single email
Per minute: 30 messages per minute (SMTP AUTH: 3 concurrent connections, 30 messages/min)
TERRL (Tenant External Recipient Rate Limit): A tenant-wide formula-based cap on external recipients, with enforcement phases extending into 2026 for larger organizations. Government cloud enforcement for TERRL began June 30, 2025.
Per-minute throttle behavior: The 30-message-per-minute throttle is a delay, not an immediate rejection — Microsoft queues excess messages and delivers them as capacity opens. The daily recipient limit is a hard block.
Practical safe limit for cold outreach: 200–500 emails per day. The 10,000 ceiling is designed for transactional and internal email, not cold outreach. Sending high volumes to new, unverified contacts triggers behavioral filters before the hard limit is reached.
Outlook.com email limit for sending
Per day: 5,000 recipients
Per message: 500 recipients
Daily non-relationship recipients: 1,000
Outlook.com free account: Approximately 300 emails/day for verified accounts with a good sending reputation.
Note: Microsoft does not publicly disclose the exact sending limit for its free service — the ~300 figure is widely reported based on community data and is affected by account age, usage history and spam flags.
Microsoft 365 Personal / Family: 5,000 recipients/day, 500 recipients per message, 1,000 non-relationship recipients per day.
The non-relationship cap explained: Microsoft 365 Personal subscribers can email 5,000 recipients they have contacted before, but only 1,000 brand-new contacts per day. For cold email outreach — where virtually every contact is new — the effective daily limit is 1,000, not 5,000.
Per message (free Outlook.com): 100 recipients maximum, including all To, CC and BCC fields combined.
What happens when you exceed limits: Outlook locks the account from sending on a rolling 24-hour basis. There is no admin override to speed up the lockout reset — support tickets won’t expedite it. You wait.
GoDaddy (Workspace email) email service limit
Per message: 100 recipients maximum per single email
Per mailbox/per user: 700,000 messages total
Per folder: 200 messages maximum
Daily limit: Not officially published for the current Professional Email product
What to watch for: GoDaddy’s hourly limit of 300 is easy to hit if you’re running multiple campaigns with overlapping follow-up sequences. If your first-touch emails and follow-ups are scheduled within the same hour across multiple campaigns, you can breach the limit without realizing it. Schedule campaigns across different time windows and use multiple sending addresses if you’re running concurrent sequences.
Learn more: GoDaddy Workspace email account limitations
Rackspace email sending limit
Per day: 10,000 recipients per 24-hour period
Per hour: No official information
Context for 2026: Rackspace is less commonly used for cold email outreach in 2026, but the 10,000 daily figure is interesting, but quite misleading. Quality enforcement kicks in well before volume limits. If bounce rates are high or spam complaints are elevated, Rackspace will throttle or block the account before the 10,000 cap is reached.
BlueHost email sending limit
Per hour: 150 emails (70 emails per 30 minutes)
Per day: Not officially published
Additional note: BlueHost will disable your account after repeated bounce-related activity until it is reviewed. Reinstatement typically takes up to 24 hours. For dedicated cold email outreach BlueHost’s infrastructure is not designed for the purpose — Gmail or Microsoft 365 with a dedicated outreach tool is a better-suited setup.
DreamHost email sending limit
Per hour: 100 recipients when sending a single message
Additional note: DreamHost allows announcement list configuration for higher-volume sends. For cold email outreach, the 25/15-minute rate limit is restrictive enough to make it impractical at any meaningful scale.
Yahoo Mail email sending limit
Per day: no information about what is the number of recipients or emails that can be sent at one time.
Per hour: Not officially published; estimated at ~100/hour based on community reporting
Learn how to boost cold email deliverability — what to fix when campaigns underperform.
Yandex Mail email sending limit
Per day browser/app: 1,000 recipients
Per day SMTP: 300 recipients
Note for 2026: Yandex Mail is largely absent from B2B outreach workflows in the European and North American markets. Mention here for completeness but it is not a recommended provider for cold email campaigns.
HostGator email sending limit
Per day: 12,000 emails
Per hour: 500 emails per domain — each subdomain gets its own separate 500/hour allocation
Note: Mailing lists over 900 addresses can only be sent during off-peak hours. Lists over 5,000 require a dedicated server or VPS hosting solution. For cold outreach, the 500/hour cap is the relevant number to watch — not the 12,000 daily ceiling.
The difference between published limits and safe outreach limits
How many emails can I send per day safely for cold outreach is a different question from what the provider technically allows.
- Free Gmail
Published daily limit: 500 emails through the browser
Safe cold outreach limit: 20–50 emails per day
Why the gap: Behavioral filters and domain reputation - Google Workspace
Published daily limit: 2,000 emails
Safe cold outreach limit: 100–150 emails per day
Why the gap: Gradual warm-up requirements and spam detection - Microsoft 365
Published daily limit: 10,000 recipients
Safe cold outreach limit: 200–500 emails per day
Why the gap: Behavioral triggers for messages sent to new contacts - Outlook.com Personal
Published daily limit: 5,000 recipients
Safe cold outreach limit: 100–200 emails per day
Why the gap: A 1,000-recipient non-relationship cap and the need to build sender reputation
The gap exists because providers use behavioral enforcement that runs independently of published quotas. A reputation-based restriction means emails continue to be sent but begin landing in Promotions or Spam long before published limits are reached — and this kind of filter is harder to recover from than a clean volume-based block.
The three factors that trigger behavioral blocks before volume limits:
- High bounce rate — sending to unverified or stale addresses
- High percentage of new recipients — contacting addresses your inbox has never interacted with
- Repetitive message content — similar copy across large batches
The solution to all three: verify your lists before sending (Woodpecker includes free email verification on all plans), warm up new accounts gradually and personalize message content.
BTW: beware of spikes in mailbox activity
This applies to every provider. A sending spike (going from near-zero to hundreds of emails in a single session) is one of the most reliable ways to trigger behavioral filtering, even if you’re well below the published daily limit.
The pattern matters as much as the number. Gradual increases — 20/day, then 30/day, then 45/day — are interpreted as normal mailbox use. Overnight volume spikes trigger filtering sensitivity immediately.
For cold outreach specifically: there is no universally “golden hour” to send emails.
Concentrating all your sends into a 9–10 AM window looks automated, creates a spike and competes against every other sender doing the same thing. Spreading sends across a longer window with random intervals is both safer for your account and better for reply rates. Woodpecker’s adaptive sending feature handles this automatically.
How Woodpecker helps you stay within your email sending limits
Woodpecker’s built-in integration with Bouncer’s Bounce Shield feature monitors your daily email volume against your provider’s limits in real time. When it detects that you are approaching your provider’s sending threshold, your campaign pauses briefly and then resumes — preventing a hard block and keeping your sender reputation intact.
Bounce Shield is active for all Woodpecker users automatically. You can see the current status in your Deliverability tab at any time.
Beyond Bounce Shield, Woodpecker’s adaptive sending feature spreads your emails across your chosen sending window using random intervals — the kind of natural, conversational-looking pattern that avoids triggering behavioral spam detection.
For teams running multiple campaigns from multiple accounts simultaneously, Woodpecker’s inbox rotation feature distributes sending load across several accounts — keeping each individual mailbox well within safe sending limits while allowing the campaign as a whole to reach more prospects per day.
Start a free Woodpecker trial and connect your Gmail or Microsoft 365 account in minutes.
Last Words about the Limits for Sending Mail
Regardless of provider, the pattern is consistent: published email sending limits are ceilings, not targets. Quality enforcement — bounce rates, spam complaints, sending patterns — will restrict your account before you reach the daily number. Sending fewer, better-targeted emails to a verified list consistently outperforms sending at maximum volume to a dirty one.
FAQ on email sending limits
How many emails can I send per day from Gmail?
Free Gmail accounts can send 500 emails per day via the browser interface or 100 per day via SMTP. Google Workspace (paid) accounts can send 2,000 emails per day with up to 10,000 total recipients per rolling 24-hour window. Trial Workspace accounts are capped at 500/day until the domain has paid a cumulative $100 and 60 days have passed.
What are the Gmail send limits for cold email outreach specifically?
The published 2,000/day Workspace limit is not a safe target for cold outreach. Gmail send limits for cold email are effectively 100–150 emails per day on a warmed Workspace account. Exceeding that with new, unverified contacts triggers behavioral spam filters that restrict your account independently of the volume quota. Keep bounces under 2%, warm up new accounts gradually and spread sends across the day.
What are the Outlook send limits for Microsoft 365?
Outlook send limits for Microsoft 365 / Exchange Online are 10,000 recipients per rolling 24-hour period, with a maximum of 500 recipients per individual message and a rate of 30 messages per minute via SMTP AUTH. Microsoft 365 Personal/Family accounts get 5,000 recipients per day but are capped at 1,000 new (non-relationship) contacts per day — which is the effective limit for cold outreach.
What happens if I exceed my provider’s email sending limit?
Your account is blocked from sending for 1–24 hours on a rolling basis. You can still receive emails and access your account during the lockout. Repeated violations lead to longer blocks and persistent high-bounce or high-complaint behavior can permanently damage your domain’s sender reputation — meaning your emails land in spam even after the lockout lifts.
Do email sending limits reset at midnight?
No. All major providers — Gmail, Google Workspace, Microsoft 365 and Outlook.com — use a rolling 24-hour window, not a calendar day. If you sent emails at 3 PM, your limit resets at 3 PM the next day. This is a common source of confusion for senders who run campaigns on consecutive mornings and expect a full reset.
Is there a difference between email limits and recipient limits?
Yes and the distinction matters. Some providers count individual emails sent (Gmail’s 2,000/day Workspace limit). Others count individual recipients (Microsoft 365’s 10,000/day). Sending one email to 50 recipients counts as 1 email but 50 recipients. If you are hitting limits faster than expected, check whether your provider counts by email or by recipient and whether CC/BCC fields count separately.
What is the safest way to send cold emails without hitting limits?
Verify your list before sending (removes invalid addresses that would bounce and damage reputation), warm up new accounts gradually over 2–4 weeks, spread sends across the full day using randomized intervals rather than bursts, keep daily volume well below the published ceiling and use inbox rotation across multiple accounts if your target volume exceeds safe single-account limits. Tools like Woodpecker automate all of these practices.
Does Woodpecker enforce its own sending limits?
Woodpecker sends emails from your own mailbox via SMTP, which means your provider’s limits are the governing factor. Woodpecker’s Bounce Shield monitors proximity to those limits and pauses campaigns before they are breached. Woodpecker also sends messages one at a time at random intervals, which means it never triggers the per-minute rate limits of providers like Microsoft 365.