$/transactional-email-api providers ↗
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sdk · .net and c#

.NET and C# email SDKs

The major providers ship NuGet packages. Choice often comes down to existing Azure or AWS commitments.

.NET teams on Azure may favor providers with first-class Azure integration. AWS-resident teams default to SES.

what to evaluate

Considerations

Use these lenses when comparing the picks below.

  • NuGet package maintenance.
  • Azure Functions and AWS Lambda support.
  • Async/await patterns.
  • IConfiguration integration.

top picks

  1. 01

    Postmark

    Transactional

    Mature NuGet package with full feature coverage.

    100/mo developer plan · $15/mo for 10,000 emails
  2. 02

    Amazon SES

    Transactional

    AWS SDK for .NET; standard for AWS-hosted .NET apps.

    Up to $200 in AWS Free Tier credits for new accounts · $0.10 per 1,000 emails
  3. 03

    SendGrid

    Transactional Marketing

    Long-standing NuGet package.

    60-day free trial only (permanent free tier was removed May 2025) · $19.95/mo for 50,000 emails
also available

Other providers shipping a .NET and C# SDK

Brevo Transactional

All-in-one with a generous daily free tier.
Mailjet Transactional

European-focused, GDPR-friendly all-in-one.
Elastic Email Transactional

Low-cost email API and SMTP relay with marketing features nearby.
Knock Notifications

Notification infrastructure with workflow engine.
Novu Notifications

Open-source notification infrastructure.
Framework integrations →

reading this as teams choosing a transactional API

Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.

Applied to .NET and C# SDKs, that means weighing idempotency keys, webhook coverage, event stream, and operating track record ahead of the rest, against high-frequency programmatic sends where a missed delivery is a product failure.