Viesti Sign in

SMTP relay for transactional email,
without the noise.

Viesti sends your receipts, password resets and notifications over SMTP or a small HTTP API, signed as your own domain. It carries transactional mail only, so no marketing mail shares its IP pools.

Start freeRead the quickstart

From sign-in to first email

  1. Add your domainPublish a DKIM CNAME, an SPF include and, when you have none, a DMARC record. The Domains page checks each one.
  2. Create an API keyOne key per application, so a leak is revoked without stopping the rest.
  3. SendPoint any SMTP client at smtp.viesti.email:587, or POST JSON to /v1/send.

SMTP

Host
smtp.viesti.email
Port
587 with STARTTLS, or 465 with TLS
Username
apikey
Password
Your API key

SMTP settings and reply codes

HTTP API

curl https://viesti.email/v1/send \
  -H "Authorization: Bearer $VIESTI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "[email protected]",
    "to": ["[email protected]"],
    "subject": "Your receipt",
    "text": "Thanks for your order."
  }'

API reference

Deliverability first

Every domain gets its own DKIM key and its own Return-Path subdomain, so SPF and DKIM both align with your From address and DMARC passes. Only verified domains can send.

Free and paid, separated

Free and paid mail leave from separate IP pools with per-destination throttling and warmup caps. Dedicated pools are available.

Abuse stopped at the source

Content is screened before it leaves, and suspicious mail is held for review, which keeps shared pools clean for everyone on them.

Bounces handled for you

Permanent bounces and spam complaints suppress the address automatically, so you stop mailing people who cannot or do not want to receive it.

Every message traceable

Activity shows each message's timeline and each recipient's outcome, with the receiving server's reply when delivery fails.

Transactional only

No campaigns, lists or open and click tracking. Tracking pixels and rewritten links hurt the inbox placement of mail people are waiting for.

Free

$0

  • 75 emails / UTC day
  • 2,000 emails / UTC month
  • Shared free IP pool
  • SMTP and HTTP API
  • All sending features
Start free

Paid

$5/mo

  • 50,000 emails / billing cycle
  • $0.10 / 1,000 extra, billed per email
  • IP pool shared among paid customers
  • Never capped
  • Cancel any time
Sign in to upgrade

75 emails a day and 2,000 a month free. An email is one accepted message, up to 50 recipients; rejected mail is not counted. Pricing details

Works with your stack

Node.jsPythonDjangoRailsLaravelGo (net/smtp)Spring BootWordPressSupabase

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