Contact person: Business Client

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Location: Khulna, Bangladesh

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a desktop application for Windows that lets me send large-scale marketing campaigns through API-based providers such as SendGrid or Mailgun, while consistently landing in the inbox rather than the spam folder. The software should include an integrated licence generator so I can issue, revoke, or extend keys for different users and set expiry dates.

Core requirements
– Native Windows installer (EXE or MSI)
– Simple UI to import recipient lists (CSV or TXT) and compose messages in plain text or HTML
– Direct integration with SendGrid and Mailgun APIs, with fields for API keys, sender identities, and rate limits
– Real-time delivery log showing accepted, deferred, bounced, and failed messages
– Mechanisms that boost deliverability (DKIM, SPF, proper header handling, and throttling controls)
– Offline licence-key generator; generated keys must activate the app and lock to machine ID or custom parameters
– Option to deactivate licences remotely

Acceptance criteria
1. I can install the program on Windows 10/11, enter my API credentials, and send a test campaign of at least 1,000 contacts without crashes.
2. Delivery statistics match SendGrid/Mailgun dashboards within an acceptable margin.
3. Messages pass inbox placement tests on popular providers (Gmail, Outlook, Yahoo) under default settings.
4. Licence generator outputs keys that correctly activate or disable the app.

Please outline your preferred tech stack (e.g., .NET, Electron, Python + PyInstaller), estimated development timeline, and any previous deliverability success stories when you submit your proposal." (client-provided description)