Postal
Open-source · self-hostable · replaces 1 SaaS tool on os-alt
postalserver/postal · unknown · ★ — · last commit unknown
License: MIT
Good fit for Teams sending real-volume transactional email that want a SendGrid-shaped HTTP API + a clear deliverability dashboard.
Weak at Marketing automation (templates, A/B, drip campaigns) is not Postal's job — pair with Listmonk or Mautic for that.
In a terminal? npx -y github:SolvoHQ/os-alt-cli sendgrid prints
the SendGrid comparison table including Postal.
how the CLI works →
Replaces these SaaS
- SendGrid · Transactional email API
Stand up Postal, create an organization + mail server, generate API credentials. In your application, swap `POST https://api.sendgrid.com/v3/mail/send` for `POST https://postal.example.com/api/v1/send/message` with Postal's `X-Server-API-Key` header. Postal accepts a SendGrid-shaped JSON body with minor field renames (`personalizations[].to[].email` → `to`, `from.email` → `from`).
README badges for the SaaS this replaces
Maintainers and forks: drop a badge in your README to link readers from the SaaS-comparison page back to your repo.
