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    GuideRate Limits

    Rate Limits

    Simply Send implements scale-based rate limits to ensure reliable delivery for all users and protect our sending infrastructure.

    Free Tier

    Tier 1 limits apply

    Standard limits for evaluation and small-scale transactional needs.

    Pay As You Go

    Tier 1-12 limits apply

    Tier increases are granted based on sending volume and reputation. Contact our support team to request a limit increase.

    Email Sending Limits

    Important: Rate limit increases are not automatic. If you need a higher tier or increased throughput, please contact our support team with details about your sending use case.

    TierRate LimitDaily LimitPlans
    Tier 11 email/sec5,000 emails/dayFree, Pay As You Go
    Tier 21 email/sec15,000 emails/dayPay As You Go
    Tier 31 email/sec30,000 emails/dayPay As You Go
    Tier 42 emails/sec50,000 emails/dayPay As You Go
    Tier 55 emails/sec100,000 emails/dayPay As You Go
    Tier 65 emails/sec200,000 emails/dayPay As You Go
    Tier 710 emails/sec500,000 emails/dayPay As You Go
    Tier 810 emails/sec750,000 emails/dayPay As You Go
    Tier 915 emails/sec1,000,000 emails/dayPay As You Go
    Tier 1030 emails/sec2,500,000 emails/dayPay As You Go
    Tier 1160 emails/sec5,000,000 emails/dayPay As You Go
    Tier 1290 emails/sec7,500,000 emails/dayPay As You Go

    Daily limits reset at midnight UTC.

    * If you exceed your daily limit, emails will be rejected until the next day.

    Handling Rate Limit Errors

    Response Code: 429

    When you exceed a rate limit, the API returns a 429 Too Many Requests response. We recommend implementing exponential backoff in your application to handle these cases gracefully.

    Rate Limit Headers

    Every API response includes monitoring headers to help you track your current usage.

    X-RateLimit-LimitThe maximum number of requests allowed in the current window.
    X-RateLimit-RemainingThe number of requests remaining in the current window.
    X-RateLimit-ResetThe Unix timestamp when the current rate limit window resets.

    Need higher limits?

    If your application requires higher throughput (e.g., >90 emails/sec) or larger daily sending volumes, please contact our support team.

    Contact Support Team