Contact person: Business Client

Phone:Show

Email:Show

Location: Varanasi, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"License-based Windows Mailer (standalone EXE) — Gmail API, SMTP, IP rotation, subject/body rotation, content types, deliverability-focused features

Overview (short)

I need a licensed, installable Windows mailer delivered as an .exe. The app will support multiple sending methods (Gmail API, SMTP, etc.), subject/body rotation, IP rotation, predefined tags/templates, and advanced deliverability features to maximize inbox placement. The software will be distributed under license keys and include usage limits and activation checks.


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Core requirements / must-haves

1. Windows standalone EXE

Installer (MSI or installer EXE) and portable EXE option. Silent install capability optional.



2. License system

License-key activation (online activation server + offline fallback).

License types: trial (limited), single-user, multi-device, reseller.

Server-side license validation endpoints (simple REST API).

Grace period / license revoke.



3. Multiple sending backends

Gmail integration via OAuth2 (Gmail API) and service account option where allowed.

Direct SMTP support with custom ports (25/465/587) and auth.

Support for third-party transactional APIs (e.g., SendGrid/Mailgun) via API keys (abstracted provider driver system).



4. Rotation and personalization

Subject rotation (list or rules).

Body rotation (multiple templates / placeholders).

Recipient-level personalization (name, city, custom fields).

Tag system / predefined tokens (e.g., {FIRSTNAME}, {ORDER_ID}) and easy UI to create tags.



5. IP rotation / proxy support

Use of proxies per connection (HTTP/SOCKS4/5).

Ability to configure multiple proxy pools and assign per-campaign sending rules.

Support for rotating NICs (if server has multiple IPs) — mechanism for selecting outgoing interface if possible.



6. Sending controls & safety

Throttling / rate limits per account/provider.

Retry logic and backoff for temporary failures.

Bounce handling and suppression lists.

Unsubscribe link/management.

Opt-out list and hard-bounce suppression.



7. Content types & generation

Plain text, HTML email.

Convert text to image (text→JPG) option to avoid text-based filters.

Convert HTML to PDF attachment option.

Inline images and attachments support.

Link shortening & link rotation.



8. Deliverability & authentication

DKIM signing support (per domain) — keys management.

SPF guidance / record check tool.

DMARC reporting integration option (aggregate reports).

Custom headers control.

From-address rotation with domain verification workflow.



9. Templates & campaign manager

Create/manage campaigns (recipients, sending schedule, templates, proxies, provider).

A/B testing for subject/body/content.

Scheduling and send windows (timezone-aware).



10. Monitoring & analytics

Per-campaign stats: delivered, bounced, opened, clicked, unsubscribed.

Logging (detailed): SMTP sessions, responses, timestamps, IP used.

Exportable reports (CSV/Excel).

Real-time dashboard in the app.



11. Security & privacy

Secure storage of credentials (encrypted).

Two-factor authentication for UI login (optional for admin).

Secure communications to license server (HTTPS).

User roles (admin/operator) and audit logs.



12. UX / GUI

Clean Windows GUI with campaign wizard.

Import recipients (CSV, Excel).

Template editor with preview and test-send.

Error console and troubleshooting assistant.



13. Update mechanism

Auto-update check and optional automatic update installer.

Signed binaries.



14. Developer-friendly API & logs

Local REST API or CLI for automation (start campaign, get stats).

Detailed log files for diagnostics.





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Advanced features to improve inboxing (recommendations)

These features help maximize inbox placement. Some require domain/infra support outside the EXE (DNS, dedicated IPs, warm-up, etc.):

1. Domain/IP warm-up assistant

Guided warm-up schedule for new sending IPs/domains (gradual ramp up).



2. Deliverability toolkit

Inbox placement checklist (SPF/DKIM/DMARC/Reverse DNS).

Seed list testing integration (send test emails to seed inboxes to check placement).

SMTP header analyzer.



3. Content intelligence

Spam-score preview (pre-send scoring using heuristics to flag risky words/structures).

Image-only vs text ratio guidance.

Convert parts of message to image (text→JPG) with readable alt text to mitigate filter heuristics.



4. Engagement-based sending

Adaptive sending: prioritize addresses with higher past engagement.

Throttle down or pause sending to segments with high bounce or spam reports.



5. Feedback loop & complaint handling

Integration with ISP feedback loops (where possible).

Automatic suppression on complaints.



6. Advanced personalization & dynamic content

Dynamic content blocks (if-else blocks) based on recipient fields.

Per-recipient asset embedding (unique coupon images, unique PDF attachments) to track engagement.



7. Link management & tracking

Rotating tracking domains to avoid single-domain blacklisting.

Option to disable tracking for privacy-focused sends.



8. Reputation management

Maintain per-sender reputation scores and report suggestions (pause underperforming senders).

IP/domain health dashboard.





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Technical architecture (high level)

Frontend: Windows native app (C# / .NET) or Electron if cross-platform later desired. Prefer native .NET for small, performant EXE.

Backend (license & optional cloud features): Simple REST API (Node.js / Python Flask / Go) hosted on server for license activation, optional analytics aggregation, and DKIM key storage (if chosen).

Local DB: SQLite for single-machine use; optional PostgreSQL for multi-user/team installations.

Sending engine: Modular drivers for Gmail API, SMTP, and provider APIs. Multi-threaded worker pool with queue.

Proxy manager: Pool manager to assign proxies per worker.

Security: AES-encrypted credential storage; TLS for all network transfers.



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Suggested tech stack

Windows app: C# (.NET 6/7) — WinForms or WPF for UI.

Local API & worker: .NET background services or integrated threads.

License server: Node.js + Express or Python Flask.

Database: SQLite (local) + optional PostgreSQL/MySQL (server).

Optional: Electron + React if you want the same UI cross-platform later.



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Deliverables

1. Installer and portable EXE (signed).


2. Source code repository (clean, documented).


3. License server source + deployed instance or deployment guide.


4. Documentation: user manual + admin guide + deliverability checklist.


5. Tests: basic unit/integration tests for core flows.


6. Demo campaign and test accounts for QA.


7. Support: 30 days of bug-fix support after delivery (negotiable).




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Non-functional requirements

Logs retention and size control.

Configurable concurrency to prevent account lockouts.

Error handling that presents actionable messages to user.

Respect Gmail & provider rate limits and OAuth policies.



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Privacy & legal

Built-in unsubscribe and suppression handling to comply with anti-spam laws (CAN-SPAM, GDPR considerations for EU recipients).

Provide guidance in docs about legal compliance — the tool will not police content but will include features to help compliance.



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Hiring note (put this verbatim when posting)

> Important: Please only contact/apply if you have completed a similar mailer/campaign-sender project before. Include links or case studies of previous projects (source code private repos, screenshots, or demos). If you don't have prior experience building mail-sending software with SMTP/Gmail API and rotation features, please do not apply.




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Example short message you can send to developers

> I need a licensed Windows mailer (EXE) with Gmail API + SMTP + provider integrations, subject/body rotation, IP/proxy rotation, template/tags system, DKIM/SPF/DMARC support, campaign manager, and deliverability-focused tools (warm-up, bounce handling, suppression list, analytics). The project must include a license server and signed installer. Only developers who have built similar mailer/campaign-sending software should reply — please share links or screenshots of prior work. Provide an itemized proposal and cost estimate.




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If you want, I can now:

Convert the above into a job posting formatted for Upwork/Freelancer/GitHub Jobs.

Produce a concise one-page requirements doc for sharing.

Create UI mockups (screens) for the main flows (campaign creation, settings, dashboard).


Which of these would you like next?" (client-provided description)