PT Scandium · Element 21 · Jakarta, Indonesia
A small team of full-stack engineers in Jakarta, twenty years each in production software, building on open source infrastructure rather than around it. We sell only what we run ourselves.
Engineering since Dec 2002 Founded Feb 2006 Jakarta, Indonesia
The firm
A small team of highly skilled full-stack engineers, each with more than twenty years of production software behind them. Go, Java, PostgreSQL, Linux. Everything we sell is written, run and supported by the same people — nothing subcontracted, nothing shipped that we would not put on our own servers.
The company
Scandium is rare, light and stubbornly heat-resistant — the filament that keeps a stadium lit through a full match, and part of the alloy that survives the temperatures of flight. We hold our software to that standard: uncommon, durable, still running long after the launch is forgotten.
Behind it is a small team of highly skilled full-stack engineers, twenty years each in production software. We built ERP systems and the satellite applications around them — the machinery that moves a company off paper and onto something it can query, across six industries.
We build on open source infrastructure, not around it — PostgreSQL, Linux and the mail stack our products sit above are other people's work, and we ship none of it. Today Scandium sells only its own software, supported by the people who wrote it. Two decades of keeping production systems alive taught us which piece quietly breaks first: email was always near the top.
How we build
Scandium builds and sells its own software. We do not take project work, and we do not run your systems for you — we ship products you install, operate and keep. Two decades of running production systems decided how they are built.
Our software runs on your server, inside your network. There is no tenant, no console we log into, and no dependency on us staying online for your systems to work.
We sit above software you already trust and write the configuration it already reads. Nothing is locked in a proprietary format, and removing our product leaves a working system behind.
State lives in a database you can back up, query, replicate and audit yourself. No opaque store, no export ticket, no format that needs us to read it.
Compiled Go, copied to the server, started by systemd. No interpreter to patch, no dependency tree to resolve, no container stack to keep alive underneath it.
Anything our software claims to have configured, it checks against reality on a schedule and reports back. Green means it was queried and confirmed, not that a file was written.
Security updates reach every plan, including the free one. We have kept systems running for two decades and we do not expect a product to be rewritten every eighteen months.
Products
Every Scandium product began as something we needed. GU.Email is the first we have released.
Product · first release coming soon
The control plane for a self-hosted Postfix, Dovecot and Rspamd mail system — and never on the mail path.
Why GU.Email exists
Three daemons, four config dialects, DNS that drifts. Nothing crashes — mail just stops arriving.
Three daemons, one truth. Postfix, Dovecot and Rspamd each hold their own idea of your domains and users.
DNS that was right last quarter. A rotated key, an SPF record past ten lookups. Valid syntax, silent rejection.
Found out by the customer. The first alert is someone asking why the invoice never arrived.
The product — GU.Email
GU.Email writes to PostgreSQL. Postfix, Dovecot and Rspamd read that same database. That is the whole design.
Mail plane
Shared state
PostgreSQL
Domains, mailboxes, aliases, keys, checks. Yours to back up and query.
Control plane
GU.Email
One Go binary. Admins reach it over HTTPS.
No opaque store, no config files to regenerate. Every query pastes into psql.
Keys generated, records written for you, then queried against live DNS. Green means resolved, not saved.
DNS, certificate expiry and daemon health, re-checked on a schedule and emailed when they break — and when they clear.
Written in the same transaction as the change, hash-chained, append-only by database grant. It cannot be skipped.
Rspamd's scores and what it filed to Junk, with release and delete — read live from the mailbox, never copied here.
OIDC sign-in with a break-glass login that outlives the provider. Two-factor everywhere, and scoped tokens for monitoring.
How it works
One file, one systemd unit, one connection string. It migrates its own schema and licenses itself as Startup — free, with no key to enter.
DKIM key generated, SPF composed inside its lookup budget, DMARC policy prepared. Paste them at your provider and they are queried back until every one resolves.
Mailboxes, aliases, spam, certificates, health — for as long as the server lives.
Technical
linux/amd64 and linux/arm64guemail — the on-disk name of the GU.Email binary and its command line127.0.0.1:9322, behind your own TLS terminatorGU.Email pricing
There is nothing to register for and no key to type in. You download one binary, start it, and it licenses itself as Startup — free, permanently, within the limits below. When you outgrow those limits you buy the upgrade from inside GU.Email itself and the new licence applies to the running server immediately. Prices are in Indonesian Rupiah — we are based in Indonesia, so Rupiah is the price and the US Dollar figure below it is a courtesy conversion. Paid plans are billed once per year and include updates and support for the full term.
One domain, a handful of people, and no budget line for mail yet.
Free
Rp 0 · USD 0
Small and medium business — production mail that can't afford a silent bounce.
Rp 1.600.000
≈ USD 89
More domains, mailboxes or aliases than the SMB plan allows.
Let's talk
quoted per deployment
The Startup licence applies itself — no account, no payment details, nothing to enter. Upgrades are bought inside GU.Email and take effect on the running server. Paid plans by card, virtual account, QRIS or e-wallet through Xendit. Paid upgrades are not open yet — the download and the in-app purchase are coming soon. All purchases are final — see our refund policy.
Questions
Yes — free forever, not a trial that expires. You download the binary and start it; it licenses itself as Startup, so there is no registration, no key to paste and no payment details. It covers one mail domain, three mailboxes and two aliases per mailbox, and it keeps receiving security updates at no charge plus one feature release a year.
There is one download for everybody: a single binary. Start it and it runs on the free Startup licence straight away — the licence is applied automatically, so nothing is emailed to you and there is no key to enter. A paid plan is a twelve-month licence for the same binary, bought from inside the running application; it lifts the limits in place, with every update released during the term and support at the level of your plan. The download and in-app purchase are coming soon.
No. GU.Email runs on your server, under your control. We never see, store or route your mail. That's the point — you keep the infrastructure, we make it manageable.
They need to be installed. guemail mail-setup reads their existing configuration and shows you the diff before anything changes. If you're beginning from a bare server, the SMB plan includes guided setup so your first domain goes live correctly.
Your mail server keeps running — GU.Email never holds your email hostage. It falls back to the Startup licence for changes, and you stop receiving updates and priority support until the licence is renewed from inside the application.
No. Scandium builds and sells its own software products only — we do not take contract, consulting or bespoke development work. GU.Email is our first product. If you need more than the SMB plan covers, and we will quote for your deployment.
From inside GU.Email, through Xendit — Indonesia's licensed payment gateway. Credit and debit cards, bank transfer via virtual account, QRIS and major e-wallets are accepted. Prices are charged in Indonesian Rupiah; the USD figure on each plan is an approximate conversion. In-app purchasing is not open yet.
No — all purchases are final and licence fees are non-refundable. That is why the Startup plan is free and permanent rather than a trial: run GU.Email on your own server, for as long as you like, and satisfy yourself before you pay. Billing errors and undelivered licences are always put right. See our refund policy.
Yes. Every purchase receives a proper invoice, and Indonesian customers can request a faktur pajak. If your company needs to be invoiced against a purchase order, write to us and we will arrange it.
By email, at the address below. Startup is answered on a best-effort basis and SMB within one business day. Business hours are Jakarta time, Monday to Friday.
Get started
The download and the in-app upgrade are coming soon. Tell us how many domains and mailboxes you run and we will let you know the moment GU.Email is available — and if you are bigger than the SMB plan, say so and we will quote for your deployment.