Let's Calendar - Support Portal

When you send emails through Let’s Calendar, your sending capacity depends on the limits imposed by your email provider (e.g., Google Workspace / Gmail or Microsoft 365 / Office 365). If you see a warning like “Daily sending limit reached”, it usually means you've hit a cap set by your email service — not by Let’s Calendar.

Here’s what these limits are, why they matter, and how to manage and prevent hitting them in future.

What Are the Email Sending Limits?

Google Workspace (Gmail)

• Google Workspace users typically have a daily sending limit of around 2,000 messages per 24-hour period. (Google Workspace)
  
  

• The total recipient limit (i.e., counting all the To, CC, and BCC addresses across all emails) is around 10,000 recipients/day for a user. (Google Workspace)
  
  

• For a single email, Gmail allows up to ~2,000 recipients, but external recipients (outside your domain) are limited (e.g., ~500 external in some configurations). (Google Workspace)
  
  

• If you exceed these limits, Google may temporarily block outgoing emails for up to ~24 hours. (Google Workspace)
  
  

Microsoft 365 / Office 365 (Exchange Online)

According to Microsoft’s published service limits:

• Recipient Rate Limit: Up to 10,000 recipients per day (24-hour sliding window) for a mailbox. (Microsoft Learn)
  
  

• Recipient Limit Per Message: You can send to up to 1,000 recipients in a single email, depending on your plan. (Microsoft Learn)
  
  

• Message Rate Limit: Maximum 30 messages per minute from a mailbox via SMTP / client submission. (Microsoft Learn)
  
  

• These limits are in place to prevent abuse (like spam) and protect Microsoft’s infrastructure. (Microsoft Learn)
  
  

Why You See “Daily Sending Limit Reached”

Here are common reasons why you might hit this limit in Let’s Calendar and receive a message like “daily sending limit reached”:

1. You’ve sent too many emails/recipients in the past 24 hours
    If you're using Google Workspace, you might have crossed the 2,000-email or 10,000-recipient threshold. For Microsoft 365, you may have reached the 10,000-recipient limit.
   
   

2. High send rate in a short time
    On Microsoft 365, even if your daily recipient limit isn’t exhausted, sending too many messages per minute (more than 30/min) may lead to throttling.
   
   

3. Burst or batch sending from Let’s Calendar
    If Let’s Calendar fires off a large batch of campaign emails quickly (especially to many recipients), it may trigger these provider limits.
   
   

How to Fix It Right Now (When You Hit the Limit)

If you get the “limit reached” message, here are steps you can take:

1. Pause further email sends
   Wait for the 24-hour window to slide so your quotas reset. Since these limits are typically based on a rolling window, capacity will free up once older sends “fall out” of that window.
   
   

2. Spread out your sends
   Rather than sending a large campaign in one go, break it into smaller batches and schedule them spread over time. This reduces the risk of hitting rate limits.
   
   

3. Use multiple sending accounts
   
   

   • For Google Workspace: If you have several Workspace user accounts, you can distribute your campaign across them (each account has its own sending quota).
     
     

   • For Microsoft 365: Similarly, you could send from different mailboxes (if allowed and set up properly).
     
     

4. Check email content and engagement
   Make sure your emails are not triggering spam filters or high bounce rates — because frequent bounces or spammy content might make the provider more restrictive (or lower your effective sending capacity).
   
   

How to Avoid This in the Future (Long-Term Strategies)

To prevent “send limit reached” errors in the long run, you can:

• Use a dedicated email sending service
  If you are regularly sending to large lists (newsletters, mass campaigns), it may be better to use an email provider designed for bulk/marketing email (e.g., SendGrid, Mailgun, Amazon SES). These are built to handle high volume and usually don’t have such tight per-user limits.
  
  

• Warm up your sending account(s)
  Especially for new email accounts, start sending gradually small volumes at first, then slowly ramp up. This helps build “sending trust” and reduces the risk of getting throttled or blocked.
  
  

• Segment your contact lists
  Send to smaller, more targeted segments. Segmenting by engagement (active vs inactive) or by list size helps you manage overall volume more intelligently.
  
  

• Monitor and manage your sending reputation
  Track metrics such as bounces, unsubscribes, spam reports, and open rates. A healthy sending reputation helps reduce the risk that your provider will penalise you or throttle.
  
  

• Set up fallback or retry mechanisms in Let’s Calendar
  (If your system supports) — For example, if some emails get deferred because of rate limits, try rescheduling them after a delay rather than failing immediately.
  
  

Summary

• “Daily sending limit” errors usually come from your email provider (Google Workspace or Microsoft 365), not from Let’s Calendar.
  
  

• Google Workspace limit: ~2,000 messages/day and ~10,000 recipients/day. (Google Workspace)
  
  

• Microsoft 365 limit: ~10,000 recipients/day + 30 messages/minute. (Microsoft Learn)
  
  

• To fix: pause sending, spread out sends, or use multiple accounts.
  
  

To avoid in the future: Consider a bulk email service, warm up your account, segment your list, and monitor the reputation.