Question 1

What does Skrybo actually do?

Accepted Answer

Skrybo lets your app send transactional email through a Resend-parity `POST /v1/emails` API, receive replies in a full-featured webmail client under the same domain, register developer webhooks, and manage suppressions, audiences, and broadcasts — all behind one dashboard.

Question 2

How is Skrybo different from Resend or Postmark?

Accepted Answer

Resend and Postmark are transactional-only relays priced per-email. Skrybo bundles the sending API AND a real webmail client under your domain in one product, is self-hostable, and prices at a fraction (1M emails/mo for $49 on Scale). Migrate by swapping the base URL — the JSON shape matches Resend.

Question 3

Do you support marketing broadcasts too?

Accepted Answer

Yes. Audiences, contacts, and broadcasts are first-class. Each broadcast enqueues one BullMQ job per recipient with RFC 8058 one-click unsubscribe headers and a hosted `/u/:token` unsubscribe page. Transactional and broadcast sends share the same suppression list.

Question 4

Is my data safe with Skrybo?

Accepted Answer

On the self-host tier, everything runs on your own infrastructure via Docker Compose — no message data leaves your servers. Secrets (DKIM private keys, per-tenant Cloudflare tokens, developer API keys, webhook signing secrets) are AES-256-GCM encrypted at rest with a master key you control.

Question 5

What happens if Skrybo shuts down?

Accepted Answer

The self-host build stays online because everything runs on your infrastructure. Message logs, contacts, and audiences export as CSV / JSON at any time. There is no vendor to lose access to.

Question 6

How does the sending pipeline work?

Accepted Answer

A verified sending domain, DKIM keypair generation, a suppression check, an atomic capacity reservation, idempotency handling, MIME assembly, and finally submission to the outbound MTA. Delivery outcomes (delivered / delayed / bounced / complained) flow back through `/internal/zonemta/events` and update the outbound log.

Question 7

Which mail engines does Skrybo use?

Accepted Answer

WildDuck for the mailbox store, ZoneMTA for outbound submission, Haraka for the public MX. All three run as Docker containers and are orchestrated together — no separate provisioning. Antispam (Rspamd + ClamAV) is opt-in via the `antispam` compose profile.

Question 8

Do I need to add a plugin or SDK to my app?

Accepted Answer

No. Any HTTP client that can POST JSON with a `Bearer` token can send. The API contract is Resend-parity, so existing Resend integrations migrate with a base-URL change.

Question 9

How is email volume billed?

Accepted Answer

Free tier includes 3,000 emails a month and one verified domain with one real webmail mailbox. Paid tiers scale linearly; top up with credit packs (+50k emails for $5, +10 mailboxes for $5) at any time. Refunds post linked negative rows in the credit ledger.

Question 10

How much does Skrybo cost?

Accepted Answer

Free tier for one domain + one mailbox at 3,000 emails/mo. Starter, Pro, and Scale plans add volume, mailboxes, seats, and features. Yearly billing gives two months free.

Frequently asked questions

Frequently asked questions