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SendGrid vs Postal

A side-by-side look at SendGrid (the paid SaaS) and Postal (the open source alternative). Use this page to decide if the switch fits your team and workflow.

SendGrid Postal
Tagline Transactional email API for apps, now Twilio SendGrid. Self-hosted mail server for sending transactional and bulk email.
License Proprietary SaaS MIT
Pricing Free 100/day; paid from $19.95/month for 50k emails. Free to self-host
Self-host option No Yes — difficulty 4/5
Hosted cloud available Yes (only option) No
Desktop apps Varies by product Web only
Mobile apps Official apps typically available None official
Ad slot — between tables

Best for

Running a full transactional mail server with a web UI and per-server tracking.

Postal strengths

  • Web UI, SMTP and HTTP API out of the box.
  • Per-server tracking (opens, clicks, bounces).
  • Modular MariaDB + RabbitMQ architecture.

Postal weaknesses

  • Running a real mail server is a deliverability project, not an install.
  • IP warm-up and SPF/DKIM/DMARC on you.
  • Many cloud providers block outbound :25 entirely.

What's the catch with SendGrid?

  • Pricing escalates sharply once you outgrow the starter tier.
  • Shared-IP deliverability issues when neighbours spam.
  • Support response times complaints on mid-tier plans.

Still unsure?

Check the full list of alternatives to SendGrid: see SendGrid alternatives, or learn more about Postal on its project page.

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Will the open source project you depend on still exist in three years?

Bus factor, maintainer burnout, funding models, and the signals that separate OSS projects that survive from those that quietly decay.

From SaaS to self-hosted: a 30-day migration playbook

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