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Transactional email

Postmark vs Resend vs SendGrid

Postmark, Resend, SendGrid side by side: price, free tier, who each one fits and when to skip it.
Item
Postmark
Resend
SendGrid
What it doesTransactional email service built around fast delivery to the inbox.Email API for developers, with SDKs and React Email templates.Twilio's email API and marketing platform for sending at scale.
Best forBest for a SaaS where a login code stuck in spam means a lost user, and fast, reliable delivery is worth paying a bit more.Best for a Next.js SaaS that wants login codes and receipts going out in an afternoon, with templates written in React.Best for a SaaS that already uses Twilio for SMS or WhatsApp and wants email on the same account and support contract.
Skip it ifSkip it if you are on a tight budget at volume: 50k emails cost more than double what Resend charges.Skip it if you send millions of emails a month and every cent counts: Amazon SES costs a fraction of the price.Skip it if you are still validating the product: there is no permanent free plan, only a 60-day trial at 100 emails a day.
SetupNeeds a developer. An afternoon of code, plus up to a day for account approval before real users get emails.Needs a developer. An afternoon to send the first email; the domain check usually clears the same day.Needs a developer. An afternoon to send the first email, once the domain DNS records are in place.
PriceFrom $15/month for 10k emailsFree, then from $20/month for 50k emailsFrom $19.95/month (Essentials)
What it costs in practiceA SaaS sending 30,000 emails a month on Basic: $15 for the first 10,000 + 20 × $1.80 = about $51/month. Rough estimate; at 50,000 the next tier is $55.A SaaS with 2,000 active users sending around 20,000 emails a month (logins, resets, receipts) is past the free 3,000, so it lands on Pro: $20/month covers up to 50,000. Rough estimate.A SaaS sending 30,000 transactional emails a month fits Essentials 50k: $19.95/month. At 100,000 it moves to $34.95. Rough estimate; newsletters are billed on top.
Free plan100 emails a month to test, with no overage.3,000 emails a month, capped at 100 a day.No permanent free plan; a 60-day trial sends 100 emails a day.
Free tier100/month3,000/month (100/day)60-day trial, 100/day
Price for 50k emails/month$55/month (Basic, 50k tier)$20/month (Pro)$19.95/month (Essentials, 50k)
SetupREST API, SMTP and SDKs; account reviewREST API, SMTP and SDKs; React Email templatesREST API, SMTP and SDKs; dynamic templates
Open sourceNo: noNo: noNo: no
Before you build
  • Until a person approves the account, you can't email any address outside the domains you verified, and link tracking stays off.
  • Plans include a monthly volume and charge for the extra: on Basic, each 1,000 emails past 10,000 costs $1.80, so a busy month raises the bill.
  • A dedicated IP starts at $50/month and is only offered from the Pro plan up to senders of 300,000 or more emails a month.
  • Message history is kept 45 days by default; longer retention (up to 365 days) needs the Pro plan or higher.
  • The free plan stops at 100 emails a day, not just 3,000 a month. On a launch day with 150 sign-ups, the last login codes don't go out until midnight UTC.
  • If you also receive email through Resend, each received email counts against the same daily and monthly quota.
  • Keep bounces under 4% and spam complaints under 0.08%. Above that, Resend may pause your sending, and the policy allows shutting the account down without warning. Never import a bought or old list.
  • Newsletters are a separate plan priced by contacts ($40/month for 5,000), on top of the transactional plan.
  • A dedicated IP only exists on the Scale plan ($90/month and up), costs $30/month extra and requires more than 3,000 emails a day.
  • There is no free plan anymore. The trial sends 100 emails a day for 60 days; when it ends, every integration using your API keys stops sending until you upgrade.
  • The old free plans were retired in 2025: sending was paused and accounts with more than 100 contacts had them deleted, with no way back after upgrading. A sign of how fast a free tier can go.
  • Essentials keeps only 3 days of activity history and has no dedicated IP; 7 days and an included IP start at Pro, from $89.95/month.
  • Downgrading Marketing Campaigns to the free plan deletes every contact in the account, so export first.
Price checked

Checked on Oct 28, 2026 · official pricing

Checked on Oct 28, 2026 · official pricing

Checked on Oct 28, 2026 · official pricing

Prices are read from each official pricing page on the date shown and can change. Always confirm before signing up.

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