Viesti is an SMTP relay and HTTP API for transactional email: receipts, password resets, sign-in links and alerts. You send from your own verified domain, every message is signed with that domain's DKIM key, and each one is traceable in the dashboard.
From sign-in to first email
- Sign in with GitHub or Google. The first sign-in creates your workspace on the Free plan.
- Add your sending domain and publish the DKIM, SPF and DMARC records the Sending domains page lists.
- Create an API key on the Credentials page.
- Send over SMTP at
smtp.viesti.email:587 or with the HTTP API at POST https://viesti.email/v1/send.
The quickstart walks through each step. For your framework's mail settings, see the guides.
At a glance
| SMTP |
smtp.viesti.email, port 587 (STARTTLS) or 465 (TLS), username apikey, password your API key |
| HTTP API |
POST https://viesti.email/v1/send with Authorization: Bearer and a JSON body |
| Per message |
Up to 10 MB and 50 recipients, from an address at a verified domain |
| Free plan |
75 emails a UTC day and 2,000 a UTC month; see pricing |
- Quickstart: send your first emailQuickstart: sign in, verify your sending domain with DKIM, SPF and DMARC records, create an API key, and send a first email over SMTP or the HTTP API.
- SMTP relay settings: host, ports, auth, reply codesSMTP relay settings for Viesti: host, ports 587 and 465, AUTH PLAIN with an API key, what the server enforces, and what each SMTP reply code means.
- Transactional email API referenceTransactional email API reference: POST /v1/send with a Bearer API key, JSON fields and limits, responses, error codes, and curl, Node.js and Python examples.
- DKIM, SPF and DMARC setup for your sending domainDKIM, SPF and DMARC setup for a sending domain: every DNS record Viesti asks for, why it exists, how verification works, and why DMARC passes.
- Sending limits, quotas and data retentionSending limits per plan: daily and monthly quotas, message size and recipient limits, authentication rate limits, the replies at a limit, and data retention.
- Bounces, complaints and suppressionsHow Viesti handles hard bounces, soft bounces and spam complaints, when an address is suppressed, and how to review and remove suppressions.
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