Blog
Email sending, deliverability and product news
Guides on authentication and sending health, plus updates from the Sendonis team. Posts are in English.
18 October 2026Sendonis Team
Introducing Sendonis: an email API with guardrails built in
Sendonis is an API-only email service launching soon, with EU-based sending and built-in deliverability guardrails. Join early access for an early-bird discount.
- announcements
- early access
- email api
- transactional email
- deliverability
18 October 2026Sendonis Team
Why Sendonis is API-only, and why we don't offer SMTP
Sendonis sends email through a REST API only, with no SMTP relay. Why: validation before acceptance, scoped keys, safe retries and tighter abuse control.
- engineering
- email api
- smtp
- security
- deliverability
18 October 2026Sendonis Team
DKIM, SPF, DMARC and custom MAIL FROM: a practical guide for transactional email
What DKIM, SPF, DMARC and custom MAIL FROM check, how alignment works, and which DNS records to publish so your transactional email is authenticated.
- deliverability
- dns
- dkim
- spf
- dmarc
- guides
18 October 2026Sendonis Team
Bounce and complaint rates: why 4% and 0.08% matter, and how automatic pausing protects you
What bounce and complaint rates measure, why mailbox providers and sending platforms care, and why Sendonis pauses sending above 4% bounces or 0.08% complaints.
- deliverability
- bounce rate
- complaint rate
- sender reputation
- email infrastructure