Postline — transactional email infrastructure for developers
Postline is transactional email delivery for teams: Send Email API, SPF/DKIM/DMARC, webhooks, and bounce handling on SRS-operated infrastructure.
The problem
Product teams depend on third-party email vendors: quotas, opaque deliverability, painful domain onboarding, and weak bounce control. When email is part of the product, that becomes an operating risk.
The solution
Postline is a transactional email platform for developers and teams, built around organization → project → domain → API key. It offers a Send Email API, domain verification (SPF/DKIM/DMARC), delivery webhooks, and bounce handling — self-hosted email infrastructure instead of a third-party provider.
Who it is for
Engineering and product teams that need passwords, invoices, alerts, and system mail with controlled deliverability — not a boxed marketing newsletter tool.
What the product covers
Send Email API and an organization → project → domain → key model
Domain verification: SPF, DKIM, DMARC
Delivery webhooks and bounce handling
SRS-operated infrastructure instead of resold SMTP
Talk about integration
Postline is transactional email delivery for teams: Send Email API, SPF/DKIM/DMARC, webhooks, and bounce handling on SRS-operated infrastructure.