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Resend regulates email volume in two ways:
  1. email volume (quota)
  2. sending rate
These limits help improve your deliverability and likelihood of reaching your recipient’s inbox.
Both sent emails and received emails (inbound) count towards your account’s email quota. Each received email counts as 1 email against your daily and monthly limits, just like sent emails.

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Free Account Daily and Monthly Email Quota

Free accounts have a daily email quota of 100 emails/day and 3,000 emails/month. This quota includes both sent and received emails. Multiple To, CC, or BCC recipients in sent emails count as separate emails towards this quota.
  • Transactional Pro and Scale plans have no daily quota limits, though the plan tier will dictate the monthly email quota. Both sent and received emails count towards this monthly quota. To see your current month usage, view the Usage page. Multiple To, CC, or BCC recipients in sent emails count as separate emails towards the monthly quota.
  • Marketing Pro plans have no email quota limits.

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Rate Limits

All accounts start with a rate limit of 2 requests per second. The rate limits follow the IETF standard for stating the rate limit in the response header. If you have specific requirements, contact support to request a rate increase.

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Bounce Rate

All accounts must maintain a bounce rate of under 4%. The Metrics page within an account and/or webhooks allow you to monitor your account bounce rates. Maintaining a bounce rate above 4% may result in a temporary pause in sending until the bounce rate is reduced. Tips to keep a bounce rate low:
  • Remove inactive user email addresses from email lists.
  • Only send to recipients who have given consent to receive email.
  • When testing, avoid sending to fake email addresses. Use Resend’s test email addresses instead.
  • If you are using open/click tracking, periodically remove recipients who are not engaging with your emails from your email lists.

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Spam Rate

All accounts must have a spam rate of under 0.08%. The Metrics page within an account and/or webhooks allow you to monitor your account spam rates. Maintaining a spam rate over 0.08% may result in a temporary pause in sending until the spam rate is reduced. Tips to keep a spam rate low:
  • Give recipients an easy way to opt-out of emails.
  • Send relevant and timely emails.
  • Only send to recipients who have given consent to receive email.