SendGrid vs Mailgun - Which Email API to Choose

SendGrid vs Mailgun is a comparison most developers face when wiring up transactional email for the first time. Both deliver reliable application email — verification, password resets, receipts, alerts — at scale. The real difference is focus: SendGrid covers marketing email too; Mailgun stays developer-first and transactional. Here's how to pick the right one.

Quick Answer

Choose SendGrid if you want a broad platform that covers both marketing and transactional email with rich templates and sub-users. Choose Mailgun if you want a developer-first transactional email API with strong deliverability tooling and detailed logs. Both send reliable transactional email — decide based on pricing at your volume and which developer experience you prefer.

What they do

Both are email APIs that deliver application email — verification, password resets, receipts, and alerts — at scale, with deliverability features (authentication, reputation, retries) so your mail reaches inboxes rather than spam.

At a glance

(Pricing and free tiers change — verify with each vendor before committing.)

Deliverability

Both support SPF/DKIM/DMARC, dedicated IPs, and reputation management. Deliverability depends as much on your sending practices (authentication, list hygiene, content) as on the provider, so configure domain authentication correctly with either.

Developer experience

SendGrid offers a broad platform and dynamic templates; Mailgun leans developer-first with a clean transactional API and detailed event logs that are handy for debugging delivery. If your priority is a focused transactional API, Mailgun feels purpose-built; if you also need marketing email and templates, SendGrid covers more.

Which to choose?

• Choose SendGrid if: you want one platform for transactional and marketing email.

• Choose Mailgun if: you want a developer-first transactional API with rich logs.

How this maps to FastStaq

FastStaq sends transactional email through a queued worker with version-controlled templates, and the email provider is configurable — so either SendGrid or Mailgun can sit behind FastStaq's email layer. FastStaq does not bundle a specific vendor; the queue and templates are yours, and you point them at the provider you choose. See Resend vs SendGrid and the Supabase + Next.js guide.

Frequently asked questions

Is Mailgun better than SendGrid? For a focused transactional API with rich logs, many developers prefer Mailgun; SendGrid wins if you also need marketing email and templates.

Which has better deliverability? Both are strong — real deliverability depends heavily on your domain authentication and sending practices.

Does FastStaq bundle one of them? No — FastStaq's email layer is provider-agnostic, so you choose.

Next steps

• Read Resend vs SendGrid

• See transactional email - how to send it

• Back to the Supabase + Next.js guide