How many emails can I send per hour on the bulk marketing relay?

Hourly volume is paced safely according to: (Monthly Volume / 20 days) / 20 hours. For example, 100k/mo sends at 250/hr, 500k/mo sends at 1,250/hr, 1M/mo sends at 2,500/hr, and 5M/mo sends at 12,500/hr.

Are dedicated IPs included with the Bulk Marketing Relay?

Yes! Every deployment up to 1,000,000 (1Mn) sends/month includes 4 Dedicated IPs (2 IPv4 and 2 IPv6 dual-stack) configured in an automated rotation pool to ensure safe reputation scaling.

Are there limits on external contact lists?

No. On the Bulk SMTP Relay, you enjoy unlimited external contact lists because you manage your subscribers directly in Mailwizz, Sendy, WordPress, or your own software.

Bulk Email Marketing Relay & High-Volume SMTP

Engineered Specifically for High-Volume Bulk Senders

Bulk marketing relay is a specialized, high-throughput SMTP transport engine that allows you to deliver massive promotional broadcasts to unlimited subscriber lists. By routing your newsletters through 171mails dedicated bulk pathways, you ensure high inboxing while insulating your mission-critical transactional streams from promotional spam scoring.

Why Senders Choose 171mails Bulk Relay:

Safe Hourly Pacing: Built-in throughput pacing based on (Monthly Volume / 20) / 20 delivers 400 active sending hours per month, preventing mailbox deferrals.
Dedicated IP Inclusions: 4 Dedicated IPs (2 IPv4 + 2 IPv6 dual-stack) included up to 1Mn monthly sends with balanced IP rotation.
Unlimited External Contacts: No contact storage fees or subscriber surcharges. Pay only for what you send.
100M+ Suppression Database: Every blast is automatically checked against our database to eliminate invalid mailboxes and spam traps before transmission.
Seamless App Compatibility: Drop-in SMTP credentials for WordPress (WP Mail SMTP), Mailwizz, Sendy, Mumara, Laravel, and custom backends.

Calculate Relay Pricing ($29/100K₹2,499/100K) → Claim $5₹399 Test Sandbox

Bulk Marketing Relay Architecture Cluster

Sub-Second Handshake

TLS 1.3 encrypted connections across ports 587, 465, 25, and 2525 with high concurrency.

Dedicated IP Rotation

Automated IP rotation distributes sending weight across clean, dedicated reputation pools.

100M+ Suppression

Instant real-time filtering of hard bounces and spam traps keeps sender scores pristine.

Flat Monthly Rates

Predictable monthly subscriptions with zero surprise overage penalties or hidden charges.