High-Volume Sending Solution

High-Volume Sending

Send millions of transactional emails per month with predictable throughput, dedicated IP reputation, automated warm-up, and contractual availability guarantees.

Audience

Large SaaS platforms sending >1M emails/month. E-commerce platforms sending order confirmations at scale. Social networks sending notification digests. IoT platforms sending device alerts. Any organization where email throughput directly affects customer experience and revenue.

Business Context

At high volume, small deliverability changes have large revenue impact. A 1% delivery degradation on 10M emails/month means 100,000 missed messages. Queue backpressure during recipient-provider throttling must not cascade into application latency. IP reputation management becomes a full-time concern without automation.

Core Problem

• Shared IP pools accumulate reputation risk from other senders.
• Queue backpressure during provider throttling affects all sending if not isolated.
• Manual IP warm-up is error-prone and slow.
• Rate limits on standard plans cap throughput below business requirements.
• Without dedicated infrastructure, peak traffic competes with other customers.

ApexMail Solution

• Dedicated IPs — Approved add-on on Pro; 1 included on Growth, 3 on Business, and 10 on Enterprise. Contract-scoped deployment options are reviewed separately.
• Automated Warm-Up — Gradual volume ramp following provider-specific schedules. Monitored for reputation signals. Manual override available.
• Queue Prioritization — Transactional traffic is prioritized ahead of bulk under load. Time-to-inbox targets monitored.
• Batch API (POST /v1/messages/batch) — Submit up to 100 messages per request. Lower per-message overhead than individual API calls.
• Rate Limits — Limits are enforced per API key and plan; see the current API documentation for public limits.
• Contractual SLA — Business and Enterprise include plan-level SLA terms; non-standard deployments require a separate contract review.

Technical Implementation

1. Request dedicated IP eligibility review from support or sales.
2. Once approved, dedicated IPs are provisioned and assigned to your account.
3. Automated warm-up begins. Monitor warm-up progress in dashboard.
4. Assign dedicated IPs to your transactional sending for reputation isolation.
5. Configure queue priority and concurrency limits.
6. Use batch API for high-throughput sending scenarios.
7. Monitor delivery latency, queue depth, and provider-specific acceptance rates.

Relevant API Endpoints

Required Plan

Security Considerations

• Dedicated IP reputation is managed exclusively for your account. Changes require account owner approval.
• Each message in a batch is validated individually; the API reports per-message acceptance.
• Queue depth and processing latency are visible in real time via dashboard and API.
• Rate limit headers returned on every response. Monitor X-RateLimit-Remaining to avoid throttling.

Known Limitations

• Dedicated IP eligibility requires a sending history review. New accounts start on shared IPs.
• IP warm-up typically takes 2-4 weeks depending on target volume and provider policies.
• Maximum batch size is 100 messages per request. Larger volumes require multiple batch calls.
• Throughput during provider outages depends on queue retry configuration and provider recovery time.

Recommended Next Action

Contact sales for a volume assessment, dedicated IP evaluation, and dedicated tenancy pricing.