Blacksteel Digital · Windows Desktop App
Personalised Bulk Email, Done Right.
A Windows application that manages contacts, matches personalised attachments, processes PDFs, and sends bulk personalised emails — all from a single window.
Free demo & full license both available on Gumroad
See the workflow
Watch the practical flow: import contacts, match the right files, preview the personalised message, and send through your own mail account.
FlashAttach checks your contact list and shows which attachment is matched to each recipient before sending.
Preview the merged subject and body for each person so placeholder mistakes are caught early.
What is FlashAttach?
FlashAttach is built for professionals and businesses that regularly send personalised bulk emails — invoices, certificates, newsletters, or reports.
Instead of manually attaching the right file to each email, FlashAttach automates the entire workflow: import your contacts, let the app find and match each person's attachment, compose your message once, and send to everyone in a single click.
Features
Eight powerful modules covering every step of your personalised email workflow.
Import your contact list in seconds — no manual data entry required.
Automatically pair the right file to the right contact — no manual renaming.
Every email addresses each recipient personally — name, company, invoice number, or any field.
Split a multi-page PDF into individual named files — ready to attach and send.
Compose once, send personalised emails to your entire contact list.
Connect to any mail service — credentials are always secure.
Manage several mail accounts in one app — switch with a single click.
Send sensitive documents safely — password-protect before they leave your machine.
Real-world impact
"Our team was sending 200 of these emails one by one. It took most of the day. With FlashAttach the same job is done before the morning coffee."
FlashAttach handles the entire workflow: import contacts, match each person's attachment automatically, personalise every message with mail merge fields, and send to everyone in a single click. The time your team saves on the first run alone justifies the investment.
Demo and license
FlashAttach is sold through Gumroad as a simple desktop software purchase. No subscription, no per-email fees, and no cloud account required.
Use the demo to confirm the workflow fits your contact lists, attachment names, mail provider, and daily process.
Unlock FlashAttach for real production runs when you are ready to replace the manual one-by-one workflow.
FAQ
Short answers for teams checking whether FlashAttach is suitable before they download or purchase.
No. Emails are sent directly through your own Office 365, Gmail, or SMTP account. FlashAttach does not relay your messages.
Yes. FlashAttach is a Windows desktop application built for Windows 10 and Windows 11.
Yes. That is the core workflow: import a contact list, choose matching rules, preview the result, then send each person their own attachment.
Yes. FlashAttach supports Office 365 via OAuth, Gmail via app password, and standard SMTP servers.
No. Contact lists, drafts, credentials, and local app data stay on your machine. There is no SaaS backend.
Email support is available at info@blacksteeldigital.com. Include your mail provider and the workflow you are trying to run.
GDPR & Privacy
FlashAttach is 100% client-side. All processing happens on your local machine — no personal data ever leaves your environment.
Both the free demo and the full license are available on Gumroad. Try it first, upgrade when you're ready — and get your team's time back from the very first run.