name: Zoho Mail API Rate Limits
description: Rate limits and sending restrictions for Zoho Mail REST API and email service
url: https://www.zoho.com/mail/help/adminconsole/rates-and-limits.html

api:
  description: Limits applied to the Zoho Mail REST API
  limits:
    - name: API Request Rate
      description: Maximum number of API requests per minute before blocking
      limit: 30
      unit: requests per minute
      enforcement: blocking for an undisclosed locking period
      notes: Subsequent requests blocked after exceeding; locking duration not publicly disclosed
    - name: Reset Window
      description: Timeframe for rate limit resets
      daily_reset: 24 hours
      rate_reset: 15 minutes

email_sending:
  description: Limits applied to outbound email sending
  limits:
    - name: External Email Sending Rate
      description: Outbound emails to external recipients per hour
      limit: 50-500
      unit: emails per hour
      notes: Dynamically adjusted based on sender reputation and recipient engagement
    - name: Internal Email Sending Rate
      description: Outbound emails to recipients within your organization
      limit: 1000
      unit: emails per hour
    - name: Recipients Per Message (External - Paid)
      description: Maximum number of external recipients per single email (paid plans)
      limit: 150
      unit: recipients
    - name: Recipients Per Message (External - Free)
      description: Maximum number of external recipients per single email (free plan)
      limit: 100
      unit: recipients
    - name: Recipients Per Message (Internal)
      description: Maximum number of internal recipients per single email
      limit: 500
      unit: recipients
    - name: Bulk Sending
      description: Bulk and burst email sending policy
      allowed: false
      notes: Not permitted under Zoho Mail business usage policy
  consequences:
    - trigger: Exceeding sending limits
      result: Error message; cannot send new messages for up to 1 hour
      notes: Receiving and account access remain functional during restriction

email_receiving:
  description: Limits applied to inbound email
  limits:
    - name: Incoming Processing Rate
      description: Maximum rate of incoming email processing
      limit: 100
      unit: messages per minute
    - name: Message Size
      description: Maximum size for a single email message including attachments
      limit: 40
      unit: MB
    - name: Attachments Per Email
      description: Maximum number of attachments in a single email
      limit: 500
      unit: attachments
  consequences:
    - trigger: Exceeding incoming rate
      result: Mail delivery suspended for approximately 24 hours; new messages rejected

connections:
  description: Connection limits for IMAP/POP protocols
  limits:
    - name: IMAP Connections
      description: Concurrent IMAP connections per account
      limit: 100
      unit: connections per account
    - name: POP Connections
      description: Concurrent POP connections per account
      limit: 5
      unit: connections per account
    - name: POP Daily Fetch Limit
      description: Maximum data fetchable via POP per day
      limit: 5
      unit: GB per day

forwarding:
  description: Email forwarding configuration limits
  limits:
    - name: Manual Forwarding Rules
      description: Number of manual forwarding configurations per account
      limit: 1-3
      notes: Varies by account type
    - name: Filter-Based Forwarding
      description: Number of filter-based forwarding configurations
      limit: 30
      unit: configurations