Under the Hood:
How Sharding Works.
Learn how Email.biz.pk routes campaigns through multiple SMTP relays to protect your sender reputation and maximize inbox delivery rates.
The Outbox Pipeline
The Path to a 98% Inbox Placement Rate
Encrypted Credential Vaulting
Connect your Google, Microsoft, or corporate SMTP accounts. Credentials are encrypted in-memory using AES-256 before being stored in the MongoDB vault.
DNS & Record Authentication
Our checker queries your domains' TXT records to verify SPF, DKIM, and DMARC settings, ensuring compliance before scheduling outbound messages.
Recipient Clean-Up Pipeline
Upload lists via CSV. The pipeline checks syntax, removes duplicates, validates active MX records, and checks against suppression lists.
Distributed Queuing (BullMQ)
Campaign dispatches are registered in BullMQ queues with a randomized delay (25-45 seconds jitter) to simulate natural human timing.
Infrastructure Sharding Relay
Our engine uses atomic Redis pointers to rotate sending accounts round-robin, ensuring no single mailbox is flagged for bulk behavior.
Real-time Metrics Tracking
Outbound emails inject tracking pixels and wrapped redirect links, pushing click and open metrics (with country/city GeoIP) via WebSockets.
Technical Guides
Module-Specific Systems
Click a module below to view its specific background processing sequences, error backoffs, and protocol specifications.
Smart Sending Infrastructure & Sharding
Our proprietary sharding engine rotates outgoing volume across multiple accounts in a strict round-robin sequence, mimicking natural human behavior to protect your sender reputation.
Security & Session Management
Your account security is our top priority. We use bcrypt hashing, JSON Web Tokens (JWT), and server-side blacklisting to block unauthorized access.
Credentials Vault & DNS Compliance
Connect your email channels securely. Credentials are encrypted in our vault with AES-256, and domain settings are monitored for SPF, DKIM, and DMARC compliance.
Campaign Builder & CSV Pipeline
Create rich templates, parse contact sheets instantly, and run deep MX-record checks to remove broken emails before clicking send.
AI Copywriting & Deliverability Suite
Leverage AI intelligence to write high-converting subject lines and identify spam words before they hurt your inbox deliverability.
Deliverability Compliance & Bounce Rules
Automate compliance with Yahoo and Google sender policies. Inject unsubscribe headers, handle hard bounces, and maintain a secure suppression list.
Real-time Tracking & Campaign Reports
Track performance in real time. Monitor opens, clicks, and geographic location statistics, and export professional PDF campaign reports.
System Alerts & Transactional Routing
Receive real-time alerts for system events, and trust that password resets and receipts deliver instantly via isolated transactional relays.
Billing & Subscription Quotas
Manage subscriptions easily. Access secure billing portals powered by Stripe and enjoy automatic plan quota updates.