Send Promotional Emails Without Destroying Your Reputation
Promotional email is the number one cause of domain reputation damage. Volume spikes, low engagement, and complaint surges can undo months of careful reputation building in a single campaign. sendmsg.io lets you send at scale with protection built in.
Why Promotional Email Is a Reputation Minefield
Understanding the risks is the first step to sending promotional email safely.
Volume Spikes
Promotional campaigns often involve sending to your entire list at once. This creates a sudden volume spike that ISPs interpret as potential abuse. A campaign that doubles your normal daily volume can trigger rate limiting or blocks.
Sudden volume spikes are a leading cause of ISP rate-limiting and inbox placement drops
Low Engagement
Promotional email naturally has lower engagement than transactional email. Recipients who ignore your promotions signal to ISPs that your messages are unwanted. Over time, this erodes your domain reputation for all email types.
Promotional emails have significantly lower engagement rates than transactional messages
Complaint Surges
Every promotional campaign generates some complaints. Recipients who have not heard from you in a while, or who forgot they subscribed, hit "Report Spam." A single campaign can push your complaint rate above ISP thresholds.
Just 0.1% complaint rate (1 per 1,000) triggers ISP filtering at most providers
Create, Schedule, and Monitor Campaigns
Build promotional campaigns with audience segmentation, scheduling controls, and live monitoring. Every campaign is managed as an independent entity with its own health state and reputation tracking.
- Audience Segmentation
Target specific segments of your contact list based on attributes, engagement history, or custom properties.
- Smart Scheduling
Schedule campaigns for optimal delivery times. Volume is distributed evenly to prevent dangerous spikes.
- A/B Testing
Test subject lines, content variations, and send times against segments before rolling out to your full list.
- Live Monitoring
Watch campaign performance live: delivery progress, engagement metrics, and reputation health, all updating as events come in.
Campaign: Spring Product Launch
Sending to 48,250 recipients
Sent
32,180
Open Rate
38.4%
Click Rate
7.2%
Health
92
Hourly Engagement
Every Sending Activity Protected by Reputation Shield
The same Reputation Shield technology that powers our transactional delivery protects every promotional campaign you send.
Automatic Throttling
When engagement drops or bounce rates climb mid-send, sending speed is reduced. The activity continues, but at a pace that preserves your reputation.
Volume Spike Prevention
Dynamic Volume Management prevents campaigns from exceeding safe sending thresholds. Large campaigns are distributed over time rather than blasted at once.
Activity Isolation
Each campaign activity operates in its own reputation context. If one activity generates high complaints, it is throttled independently. Your other activities and campaigns are unaffected.
Engagement-Based Pacing
Sending speed adapts to live engagement. High engagement means the campaign can maintain speed. Dropping engagement triggers protective slowdowns.
Domain Health Score
Your domain health score is monitored throughout the campaign. If the score starts declining, protective measures activate before lasting damage occurs.
ISP-Aware Delivery
Sending rates are adjusted per ISP based on live feedback. If Gmail starts deferring, sending to Gmail slows while other ISPs continue at full speed.
Your Sending Capacity Reflects Your Engagement
Traditional platforms give you a fixed sending quota: 50,000 emails per day, regardless of whether anyone is reading them. This approach ignores the most important factor in deliverability: recipient engagement.
sendmsg.io ties your sending capacity to your actual engagement metrics. High open rates, healthy click-through rates, and low complaint rates earn you higher sending limits. When engagement dips, limits adjust downward to protect your reputation before ISPs notice.
Capacity grows: you earn more sending volume
Capacity stable: current levels maintained
Capacity reduces: protective throttling active
Sending paused: reputation preservation mode
Engagement-to-Capacity Relationship
Higher engagement rates unlock greater sending capacity. The relationship is non-linear . Strong engagement yields disproportionately higher limits.
Build Emails Visually or Code Them Yourself
Every plan includes an HTML editor with our template language for dynamic content and personalization. Advanced and Enterprise plans unlock the visual drag-and-drop builder powered by Unlayer. Build responsive templates without writing a single line of code.
- HTML editor with template language on every plan
- Visual drag-and-drop builder on Advanced & Enterprise plans
- Responsive by default: templates adapt to mobile, tablet, and desktop
- Personalization variables: insert recipient name, company, custom fields
- Template library with pre-designed layouts for common campaign types
- Preview and test before sending: see exactly what recipients will see
Live Campaign Analytics
See how your campaign is performing as it sends, not hours later in a batch report.
Delivery Tracking
Live view of delivery progress: how many sent, how many delivered, how many pending. Updated continuously as the campaign progresses.
Open Rate Monitoring
Track open rates as they happen. See which subject line variants are performing better and how engagement evolves over time.
Click Tracking
Per-link click tracking shows which content drives action. Heatmap data reveals where recipients engage most in your email.
Reputation Health
Your domain health score is displayed alongside campaign metrics. See how the campaign is affecting your overall reputation as it sends.
Safe at Any Scale
Whether you are sending to 1,000 subscribers or 1,000,000, the system adapts to protect your reputation at every volume level.
1K - 10K recipients
- Smart Warmup for new domains
- Engagement monitoring from day one
- Foundation-building volume management
- Full campaign analytics
10K - 100K recipients
- Dynamic daily capacity that grows with reputation
- ISP-specific sending rate optimization
- Activity-level reputation isolation
- A/B testing with engagement tracking
100K - 1M+ recipients
- Multi-infrastructure load distribution
- Per-ISP adaptive throttling
- Cross-ISP reputation monitoring
- Volume distributed across optimal time windows
Send Campaigns via API
Integrate promotional sending directly into your application with our campaign API.
const response = await fetch('https://api.sendmsg.io/v1/campaigns', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
name: 'Spring Product Launch',
from_email: '[email protected]',
subject: 'Introducing our newest features',
template_id: 'tmpl_abc123',
audience: {
segment_id: 'seg_active_users',
},
schedule: {
send_at: '2026-04-01T09:00:00Z',
timezone: 'America/New_York',
},
// Reputation Shield handles throttling,
// volume management, and ISP-specific
// delivery optimization on its own.
}),
});
const campaign = await response.json();
console.log('Campaign created:', campaign.id);
// Status: "scheduled" → "sending" → "completed"Promotional Email, Without the Risk
Start sending promotional campaigns with the confidence that your domain reputation is protected at every step. No more choosing between growth and deliverability.