SendLayer Blog

Looking for the best email API provider in 2026? We tested SendLayer, Postmark, Mailgun, SendGrid, Amazon SES, and more to find the fastest, cheapest, and easiest options.

This guide breaks down real-world deliverability, pricing at scale, and integration complexity—so you don’t pick a tool that hurts your inbox rates or blows up your costs.

Whether you’re building a SaaS, running WordPress, or sending millions of emails, you’ll find clear recommendations based on your exact use case.

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Learn how to send authentication emails in NextAuth using SMTP or an email API like SendLayer.

This comprehensive guide walks you through configuring the NextAuth Email provider, setting up magic link authentication, and choosing between SMTP and API-based delivery.

Send secure, passwordless login emails, customize templates, and troubleshoot common issues.

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If you’ve just set up a new website or you’re starting a business, it’s natural to want to kick off your marketing strategy with an email campaign.

But sending promotional emails (or even transactional emails) from a brand new domain with no reputation may result in them being marked as spam.

In this post, we explain exactly how to warm up a new domain for sending email and go over some other best practices to ensure your emails reach the inbox.

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Domain reputation is one of the main factors affecting email deliverability.

Because there’s no single answer to the question of how domain reputation is calculated, it can seem a bit of a mystery.

Read our guide to learn more and find out what you can do to protect and improve your domain reputation.

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