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 streams 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 — 1 managed dedicated IP on Growth, 1 on Business, up to 3 on Enterprise, 2 on Dedicated Tenant. IP eligibility review for all plans.
• Automated Warm-Up — Gradual volume ramp following provider-specific schedules. Monitored for reputation signals. Manual override available.
• Queue Prioritization — Per-stream priority configuration. Transactional streams processed ahead of broadcast. Time-to-inbox targets monitored.
• Batch API (POST /v1/emails/batch) — Submit up to 1,000 emails per request. Lower per-message overhead than individual API calls.
• Rate Limits — Up to 10,000 req/min on Enterprise. Dedicated and BYOC plans support negotiated limits.
• Contractual SLA — 99.9% API availability on Enterprise. Enhanced SLA on Dedicated Tenant and BYOC.

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 transactional streams for reputation isolation.
5. Configure per-stream 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.
• Batch API requests are atomic: all messages in a batch succeed or fail together (no partial completion).
• 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 1,000 emails 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.