Unlimited Cold Emails From 1000's of Mailboxes
Intelligent SMTP proxy & HTTP API that automatically manages quotas, rotates senders, and distributes emails across unlimited mailboxes. Works with any SMTP-compatible software like Spotzee, Ongage, MailWizz, Sendy, and more.
Cold email infrastructure shouldn't be this hard.
Account Suspensions
You're manually monitoring 50+ Gmail accounts, terrified of hitting sending limits. One mistake = suspended account = lost revenue.
Multi-Account Chaos
Switching between mailboxes, tracking who sent what, remembering which accounts are "warmed up" - it's impossible to scale.
No Per-Mailbox Quotas
Your email software handles sending limits, but you can't set individual quotas per provider/mailbox. Gmail account needs different limits than your SES?
Send More. Never Hit the Limits.
One SMTP endpoint. Unlimited mailboxes. Intelligent routing that respects your quotas and maximises deliverability. Native Gmail API and Microsoft Graph API support for higher volume sending.
Unlimited Provider Distribution
Distribute emails across unlimited providers—Gmail, Outlook, Amazon SES, custom SMTPs—all from a single connection.
Per-Mailbox Quota Controls
Set granular limits per provider/mailbox—per second, minute, hour, day, or percentage of capacity. Each mailbox/provider accounts managed independently.
Instant Failover
Provider/Mailbox A hits quota? Provider/Mailbox B sends within seconds. Zero downtime, zero manual intervention.
MailWizz, Mautic, Custom App...
Intelligent Routing · Granular Quotas
Authentic Sender Identity
Emails from Sally's inbox use Sally's name and email—not generic aliases. Real people, real inboxes, real deliverability.
Works With Your Tools
Connect via SMTP or HTTP API. Works with MailWizz, Mautic, Sendy, Moosend, or integrate directly into your custom apps.
Dynamic Personalisation Tags
6+ tags like [DP_FROM_NAME], [DP_FROM_EMAIL] for signatures. When Sally's provider is selected, her details populate automatically.
Set Up in 2 Minutes. Scale Limitlessly.
Connect Mailboxes
Add unlimited mailboxes - Both SMTP & API providers with ease.
- Gmail, Outlook, custom SMTP, SES etc.
- Bulk CSV upload for 100+ accounts
- Bulk set sender name & email, reply-to name & email, & tracking domain
Set Smart Quotas
Define your limits—we enforce them and route intelligently.
- Fixed: 1/sec, 50/hr, 50/day per mailbox
- Range: 1–5/minute (Human-like Sending Patterns)
- Zero risk of mailbox suspensions
Start Sending
Point your software/tools to Spotzee's SMTP/HTTP endpoint.
- MailWizz, Mautic, Sendy, etc.
- Any SMTP-compatible software
- X-* headers to route via specific provider/mailbox groups
Built for Cold Email at Scale
Smart Quota Control
Never exceed limits again
- Per-second, minute, hour & day limits
- Auto-throttle before hitting limits
- Never risk account suspension
Instant Failover
Maxed out? No problem.
- Routes to backup provider in <1 second
- Triggers automatically on quota hit
- No manual intervention required
- Zero downtime, zero missed sends
Human-Like Sending
Stop looking like a bot
- Set ranges, not fixed limits (e.g. 1-5/sec)
- Randomises within range every 5 mins
- Mimics natural human behaviour
Sender Rotation
Vary every sender automatically
- Rotates email, name & reply-to
- Recipients see varied senders
- Boosts deliverability & responses
Real-Time Analytics
Full sending visibility
- See which provider sent what
- Monitor quota usage per account
- Track status, retries & failures
- Filter by provider, time, status
Group-Based Routing
Isolate your campaigns
- Dedicated accounts per campaign
- Separate providers for follow-ups
- Full campaign isolation
- X-Delivery-Route header control
Universal Compatibility
Works with your tools
- MailWizz, Mautic, Sendy & more
- Any SMTP-compatible software
- API for programmatic sending
- Keep your existing workflow
Pay-Per-Send Pricing
No fees or subscriptions
- $0.10 per 1,000 emails
- $10 for 100,000 emails
- Top up anytime, never expires
- Auto-reload available
One Proxy. Endless Possibilities.
Cold Email
Use warmed inboxes for campaigns
Send through warmed-up accounts with quota protection.
Separate prospecting & follow-ups
Route each through different provider groups.
Test across providers
10% Gmail, 10% Outlook, 80% best performer.
Scale without more accounts
50 mailboxes can send 3X more with optimised quotas.
Protect top senders
Reserve best inboxes for qualified leads only.
Your Questions, Answered.
Technical Specifications
- SMTP (ports 587, 2525) with STARTTLS encryption
- HTTP REST API with JSON
- Basic authentication
- VERP (Variable Envelope Return Path) support
Simple, Transparent Pricing
That's it. No monthly fees. No subscriptions. No surprises.
What You Get
Volume Examples
How It Works
vs. Other Email Infrastructure Costs
Smart distribution your email platform lacks – at a fraction of the cost.
Get Started in 2 Minutes
Create Free Account
- Sign up at spotzee.com (60 seconds)
- No credit card required for signup
- Comes with free $1 credit (10K emails)
Connect Your Providers
- Add providers manually
- Set individual quotas
- Start sending immediately
- Download CSV template
- Fill in 50+ providers
- Bulk upload in one click
Configure Your Tool
Point any SMTP tool to Spotzee:
host: smtp.sendmux.aiport: 587username: smtpuserpassword: [your-api-key from dashboard]Send Your First Campaign
- Start with a small test (100 emails)
- Watch real-time analytics
- See automatic provider rotation
- Scale to thousands with confidence
Security & Reliability
Security
- AES-256 credential encryption
- TLS/SSL email transmission
- DKIM signing support
- Regular security audits
- No email content storage
Compliance
- GDPR compliant
- CAN-SPAM compliant
- DPA available on request
Reliability
- 99.9% uptime SLA
- 10M+ emails daily
- Redundant infrastructure
- 24/7 monitoring
- Auto health checks