Automating Bulk Email Sending with a Desktop App

Manual email sending does not scale

A client needed to send marketing emails to large lists of target accounts without manually logging into Gmail and sending each one by hand. That manual process is exactly the kind of repetitive, rule-based task worth automating rather than optimizing by hand.

A desktop app, not just a script

We built a Flutter desktop app where a user loads a list of target emails and sender accounts, then starts automation with a single click. Behind that simple interface, Selenium drives a real Chrome browser, logs into Gmail, and sends emails from the provided account list, cycling through multiple sender accounts rather than hammering a single one.

Building this as a desktop app rather than a script mattered for the actual user: someone without a technical background needed to run this reliably on a Windows machine, without touching a terminal.

What this became the foundation for

Delivered as a standalone desktop tool for one-click bulk sending, this later became the basis for a second, browser-based version built as a Chrome extension once the client needed to run more sending volume in parallel, which is a separate story worth its own writeup.