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API Rate Limits, Quotas & Sent Email Logs

MailFuz Pro includes a dedicated API Limits & Quotas control center (MailFuz → API Limits & Quotas). This cockpit monitors your third-party email REST APIs in real time, tracks used vs. total capacity, alerts you before hitting cloud rate limits, and maintains a detailed log of every email dispatched through external APIs.

1. Overview & Capabilities

Section titled “1. Overview & Capabilities”

When routing high volumes of transactional and marketing emails through cloud APIs (Twilio SendGrid, Amazon SES, Postmark, Mailgun, Brevo, Resend), visibility into your quota consumption is critical to avoid abrupt provider cutoffs or unexpected overage bills.

Live Quota Capacity

Visual used / total progress gauges with color-coded alerts (Green < 70%, Amber 70–90%, Red > 90%).

Real-Time Provider Sync

Synchronizes authoritative limits from AWS SES (GetSendQuota), SendGrid (/user/credits), and Brevo (/account).

Detailed Sent Email Logs

Maintains recipient-level audit records including email address, subject, status, provider response, and timestamp.

Slide-Over Inspector

One-click transmission inspection revealing full RFC 822 headers, message body snippets, and error traces.

2. Supported Provider Telemetry & Sync

Section titled “2. Supported Provider Telemetry & Sync”

MailFuz Pro queries each cloud provider’s API directly while caching data safely in WordPress transients to eliminate unnecessary API overhead:

Provider Authoritative Quota Endpoint Rate Limit Threshold Reset Cycle
Amazon SES Action=GetSendQuota (SigV4) 14 – 50 msgs / sec (MaxSendRate) Rolling 24-Hour Window
Twilio SendGrid /v3/user/credits + rate headers 10,000 requests / min burst Monthly Plan Reset
Postmark X-Postmark-Rate-Limit-* + Server stats 600 req / min (10k burst / 10s) Monthly Subscription
Mailgun /v3/{domain}/stats/total + domain stats 300 req / min Monthly Foundation / Growth
Brevo /v3/account (plan & credits) 40 / hr & 300 / day relay cap Plan Credits / Subscription
Resend /api-keys + ratelimit-* headers 2 – 10 requests / sec Monthly Sending Quota

3. Sent Email Details & Telemetry Inspection

Section titled “3. Sent Email Details & Telemetry Inspection”

The lower section of the dashboard provides an authoritative transmission ledger for third-party email APIs:

  1. To (Recipient): The exact destination mailbox address that received the email.
  2. Subject: The subject line delivered to the provider.
  3. API Provider Tag: Identifies whether SendGrid, Amazon SES, Postmark, Mailgun, Brevo, or Resend handled the dispatch.
  4. Delivery Status: Immediate confirmation of delivery (Sent) or failure with specific error descriptions.
  5. Inspect Action: Opens the slide-over inspection modal displaying:
    • Full recipient and provider metadata
    • Client IP address and dispatch timestamp (UTC)
    • Complete RFC 822 / MIME transmission headers (including Message-ID and custom headers)
    • Message body preview
    • Cloud provider error message (if a delivery attempt was rejected)

4. Customizing Your Plan Limit

Section titled “4. Customizing Your Plan Limit”

For providers where custom contract plans or restricted API key scopes are used (e.g. an API key with only Mail Send permission), MailFuz Pro lets you configure your exact monthly plan limit:

  1. Click Set Plan Limit on the respective provider card.
  2. Enter your monthly allocated sending cap (e.g. 50000, 100000).
  3. Click Save Plan Limit.
  4. MailFuz immediately recalibrates your capacity gauge, remaining email countdown, and usage percentages.

5. Automated Smart Failover Protection

Section titled “5. Automated Smart Failover Protection”

If any cloud API reaches 100% capacity or returns an HTTP rate limit error (429 Too Many Requests), MailFuz’s Smart Failover Router automatically redirects delivery through your configured secondary mailer with zero email loss.