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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 early-stage startups

At an early stage the deciding factors are what the free tier actually covers, what the first paid invoice looks like, and how much of a founding engineer's week the setup costs. Feature depth that only matters at a million sends a month is noise until it is not.

Applied to .NET and C# SDKs, that means weighing free tier, best published rate per 1,000, entry price, and developer experience ahead of the rest, against a waitlist, a launch announcement, onboarding email, and the first transactional sends.