100% Client-Side Dispatch • Zero Server Data Storage

Send High-Volume Emails Directly From Your Browser. No List Tax. No Subscriptions.

Connect your own Gmail, Google Workspace, Resend, or SMTP credentials. Parse your CSV locally, inject dynamic {{tags}}, and safeguard deliverability with real-time spam scoring and anti-throttle safety intervals—without paying recurring SaaS contact markups.

100% Private (Local RAM Processing)
Multi-Gateway (Gmail, SMTP, Brevo, Resend)
Dynamic {{Merge Tags}}
Real-Time 120+ Spam Trigger Scorer
Smart Anti-Throttle Delay

Upload Your Recipient Contact List

Drag and drop any CSV, TXT, or Excel export file, or paste your email list directly.

Option A: Upload CSV File Auto-Detect

Drag & drop your CSV or TXT here

Supports .CSV, .XLSX, .TXT, and .TSV formatted lists

Browse Computer
Option B: Paste Plain Text / CSV Direct Paste
Format: Email, First Name, Company CSV / Plain Text
Deliverability Engineering

3 Golden Rules to Protect Sender Reputation & Land in the Inbox

Modern inbox providers (Google, Yahoo, Microsoft) enforce strict sender verification and rate-limit policies. Follow these industry standards to safeguard your domain reputation.

1. Enforce SPF, DKIM & DMARC

Unauthenticated bulk emails face immediate rejection or spam folder relegation. Ensure your sending domain has an active SPF record (v=spf1 include:... ~all), an aligned 2048-bit DKIM key, and a live DMARC record (p=none or p=quarantine). Proper DNS alignment ensures maximum inbox reach.

Google & Yahoo 2024+ Compliant

2. Maintain a Sub-2% Bounce Threshold

Hitting invalid, disabled, or typo-ridden mailboxes permanently penalizes your sending reputation. Our built-in client parser validates RFC 5322 syntax in memory, strips malformed recipient addresses, and eliminates duplicates before a single dispatch occurs.

In-Memory Pre-Flight Scrubbing

3. Humanize Dispatch Cadence

Blasting concurrent bursts triggers automated ISP firewall throttling. Our configurable 2-to-10 second anti-throttle safety delay, paired with dynamic {{merge_tags}}, creates naturally staggered, human-like dispatches that protect your gateway from blacklisting.

Configurable Anti-Throttle Interval
Architecture Comparison

In-Browser Client Dispatch vs. Traditional Email SaaS

Traditional email platforms charge predatory contact list tiers, lock you into shared IP pools, and store your confidential customer data on third-party cloud servers. In-browser client dispatching gives you total data sovereignty, zero recurring fees, and instant gateway flexibility.

Feature & Capability OviTech In-Browser Studio Legacy Email SaaS (Mailchimp, etc.)
Data Storage & Privacy
100% Local RAM (Zero Server Storage / GDPR Safe) Stored permanently on 3rd-party vendor cloud servers
Pricing & Contact List Fees
$0 Forever (No List Tax or Contact Surcharges) Expensive monthly plans that escalate as your list grows ($50–$500+/mo)
Gateway Freedom & Switching
Any Gateway (Gmail, Workspace, SMTP, Brevo, Resend) Locked into vendor-owned shared IP pools and strict egress policies
Spam Trigger Scorer
Real-time 120+ trigger word heuristic analyzer Basic or locked behind high-tier enterprise subscriptions
Credential & API Key Security
Ephemeral client memory; wiped automatically on tab close Persistently saved across vendor databases and cloud logs

Recommended Safe Daily Sending Volumes by Provider

Gmail Personal 100–150 Google Cap: 500/day
Google Workspace 500–1,500 Google Cap: 2k/day
Microsoft 365 Up to 1,000 Exchange Safe
Brevo Free API 300 / day 100% Free Tier
Resend Free API 3,000 / mo 100 / day Free
Got Questions?

Frequently Asked Questions

Everything you need to know about bulk email dispatching, gateways, and deliverability.