Custom unified inbox — bring your own provider, keep your data.
We've shipped a unified inbox that bridges Gmail / Outlook / Microsoft 365 / IMAP+SMTP, shows everything in one queue, supports shared team inboxes, and turns email threads into deals or tasks in one click. The data stays where you tell it to.
A production-grade email module already built and running. We ship a custom one for clients who need their own.
ragenaizer.com / emailWhat goes inside a real email.
These are the moving parts we've shipped before. Your custom build picks a subset — and we tell you upfront which parts are worth re-implementing and which ones aren't.
Multi-provider connect
Gmail / Outlook OAuth, Microsoft 365 OAuth, generic IMAP+SMTP. Per-user multiple accounts.
Shared inboxes
Sales@, support@, info@. Multi-assignee, internal notes, SLA timers, auto-responses.
Threading & search
Conversation-level threading, full-text search across all connected mailboxes.
Turn email into work
One click: thread → deal, thread → ticket, thread → task. Attached customer record.
Templates & snippets
Per-team templates, variables, signatures.
Send-as
Send as a shared inbox without exposing your personal address.
Filters & rules
Inbox automations — labels, routing, auto-assign.
Self-host
Optional on-prem deployment with bring-your-own SMTP — mail never leaves your infrastructure.
The problems that don't show up in the demo.
These are the ones that take a custom build from "works in a screenshot" to "works in production for three years." We've already learned them once.
- 01 OAuth flow + token refresh that survives Google's quarterly auth changes.
- 02 IMAP sync at scale — hundreds of mailboxes, IDLE connections, partial-fetch logic, deduplication.
- 03 Threading across providers — Gmail's conversation model, Outlook's, IMAP's RFC threading — all reconciled.
- 04 Encrypted attachment storage with the same audit trail as the rest of the platform.
- 05 Bounce / complaint feedback loop handling so you don't get your sender reputation tanked.
How we'd put it together.
ASP.NET Core, Postgres for metadata, S3-compatible storage for raw MIME, Redis for IDLE connection pool state, a worker fleet for sync. Optional SMTP relay (Postfix / Haraka) for self-host.
We'll tell you when not to build.
Custom isn't always the right call. We've shipped Ragenaizer so we can say that honestly.
- →The email is the moat — your competitor can't have the same one.
- →You have compliance / sovereignty / data-residency requirements no SaaS will satisfy.
- →You need to integrate at a level deeper than off-the-shelf vendors expose.
- →Per-seat pricing across thousands of users makes the build cheaper inside 24 months.
- →The workflow is generic enough that a configurable platform will do.
- →You want it in weeks, not quarters.
- →You'd rather buy than own — let someone else maintain the email forever.
- →Your engineering capacity should go to the parts of your product that no SaaS covers.
Custom email? Tell us what you need.
One conversation. We tell you whether it's a custom build, a Ragenaizer rollout, or something we shouldn't take on.