This post links to Resend and Postmark as affiliate links. I pay for both. I'd recommend the same tools if the affiliate program didn't exist.
I run production accounts on Resend, Postmark, and SendGrid. SendGrid carries a legacy SaaS, Postmark handles a side project's transactional flow, Resend powers everything new. 18 months in parallel. Here's the comparison.
Short version
new projects in 2026: Resend. better DX, modern API, no surprise pricing, the team answers support tickets.
high-reliability transactional with paranoid deliverability tracking: Postmark. best-in-class deliverability and monitoring.
legacy stuff already on it, or you need SMS/voice in the same provider: SendGrid (under Twilio). wouldn't start there in 2026.
Where Resend wins
Modern API. the SDK is small, idiomatic, the docs match reality. send an email with their Node SDK in 3 lines. same for Python, Ruby, Go. no XML, no enterprise-tier gating on basic features.
Domain verification that works. add a domain, paste DNS records, click verify. 5 minutes. Postmark's flow is similar. SendGrid's is a maze of "click here to start the journey..." dashboards.
React Email integration. if your app is React, write your templates in React too. <Button href={...}>Confirm</Button> beats any email template language I've used.
Audiences (mailing lists) built-in. no separate marketing email product to pay for. useful for indie SaaS that needs transactional plus an occasional newsletter.
Reasonable pricing. free tier (3k emails/month). Pro starts at $20/mo for 50k emails. basic features aren't behind enterprise tiers.
Where Postmark wins
Deliverability. Postmark built a reputation as the transactional-only provider that ruthlessly excludes marketing email. that focus shows up as best-in-class inbox placement. their team will email you when your bounce rate spikes.
Bounce and complaint handling. Postmark's dashboard surfaces these where you'll see them. Resend's is decent. SendGrid's is buried.
Detailed activity logs. customer says "I didn't get the email," Postmark finds that exact send in seconds and shows what happened (delivered, bounced, opened, clicked). Resend has this now too. SendGrid charges for Add-Ons to get the same.
Webhook reliability. Postmark's webhooks retry, have a proper status dashboard, don't quietly drop events.
Where SendGrid still wins
SMS + Voice in one provider. Twilio owns SendGrid. if your product needs SMS notifications plus email plus voice, one billing entity matters.
Enterprise compliance. selling to a customer who requires SOC 2 plus GDPR plus ISO 27001 plus HIPAA BAA plus dedicated IPs plus the rest of the compliance kitchen: SendGrid has every certification. Resend is getting there. Postmark has most.
Pre-built marketing campaign tooling. SendGrid's marketing campaign builder is more mature than Resend Broadcasts. not ConvertKit-class, but workable if you want email plus marketing under one roof.
Cost reality
typical SaaS sending 10k emails/month:
- Resend: $20/mo (Pro tier, includes audiences)
- Postmark: $15/mo (10k transactional plan)
- SendGrid: $20/mo (Essentials, watch the add-on charges for activity feed, dedicated IP, etc.)
at 100k emails/month: Resend $35, Postmark $50, SendGrid $90+. Resend wins on price at scale.
The deliverability question
deliverability is mostly about YOUR domain reputation, content, and list hygiene. the provider matters less than people think. all three will land in the inbox if you do the basics right (SPF, DKIM, DMARC, low complaint rate, opted-in recipients).
where the provider does matter: SHARED IP reputation. SendGrid's lowest tier shares an IP with thousands of senders, some of them spammers. if you're starting from zero domain reputation, that can hurt. Postmark gives you a dedicated transactional IP from day 1 on the lowest paid tier. Resend handles IP warmup automatically.
What I do
new projects: Resend. the DX wins.
legacy SaaS already on SendGrid: stay on SendGrid until migration ROI justifies the work.
any product where deliverability is the business (cold-email-as-service, time-sensitive notifications): Postmark.
More production-use comparisons at tools.thesoundmethod.me, written from real use, not vendor PR.
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