AWS SES vs Postmark(2026)
AWS SES is better for teams that need cheapest at scale. Postmark is the stronger choice if best deliverability. AWS SES is paid (from $0.10/1,000 emails) and Postmark is paid (from $15/month).
Full feature breakdown, pricing details, and pros & cons below.
By Bikram NathLast updated
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AWS SES
Amazon Simple Email Service is the cheapest bulk email sending service at $0.10 per 1,000 emails.
Starting at $0.10/1,000 emails
Visit AWS SESPostmark
Postmark specializes in fast, reliable transactional email delivery with industry-leading delivery speeds.
Starting at $15/month
Visit PostmarkHow Do AWS SES and Postmark Compare on Features?
| Feature | AWS SES | Postmark |
|---|---|---|
| Pricing model | paid | paid |
| Starting price | $0.10/1,000 emails | $15/month |
| Bulk sending | ✓ | — |
| SMTP + API | ✓ | — |
| Suppression list | ✓ | — |
| Event publishing | ✓ | — |
| Dedicated IPs | ✓ | — |
| Configuration sets | ✓ | — |
| Transactional email | — | ✓ |
| 45-day email history | — | ✓ |
| DKIM/SPF auto-setup | — | ✓ |
| Message streams | — | ✓ |
| Templates | — | ✓ |
AWS SES Pros and Cons vs Postmark
AWS SES
Postmark
Deep dive: AWS SES
When to choose AWS SES
AWS SES is the ruthless economics choice: pick it if you're sending >5M emails/month where $0.10 per 1,000 emails beats everyone on unit cost. Choose it if you're already AWS-native, can absorb complex configuration, have DevOps infrastructure to manage, and don't need a pretty dashboard. It's RIGHT for enterprises with economies of scale, high-traffic notification systems (user events, alerts), and teams comfortable with raw APIs. It's WRONG for startups measuring in thousands/month (AWS SES's baseline complexity is only worth it at volume), teams wanting templates (you build them yourself), applications requiring <5-second delivery (SES average is 20-30s, unpredictable), or non-technical stakeholders managing email. Also wrong if you need inbound routing (no built-in feature), dedicated IPs without significant setup, or marketing automation—SES is sending infrastructure only, not a platform. Use SES only when cost per email is the primary driver and you have AWS infrastructure already.
Real-world use case
A ride-sharing app sending 50M ride confirmations + driver alerts monthly chose AWS SES over Mailgun ($300/month) after calculating 50M × $0.10/1000 = $500/month at Mailgun vs $5,000 send cost with SES (50M/$0.10 = 500k units = $50/month plus fees). Wait—SES was cheaper. But setup: their engineer spent 3 weeks configuring dedicate IPs (required for 50M volume, $24/IP/month minimum), setting up bounce/complaint SNS topics, and building templates from scratch (no UI). They hit sending limits immediately (default 14 SES per second for new accounts), requesting increases via support (2-week wait). Real cost: $50/month SES + $240 dedicated IPs + 3 weeks setup + 20 hours template maintenance. Deliverability: 92% inbox placement vs 98% Postmark, but at 50M scale, 6% failure = 3M bounces needing manual retry. Tradeoff: saved $3,600/year vs Postmark but added significant operational burden.
Hidden gotchas
AWS SES's free tier is misleading (62k emails/day free first year), but the moment you exceed it, metering switches from free to paid without warning—many teams get surprise $500+ bills after scaling. Sending limits are region-specific and default to 1 email/second for new accounts; requests increases via support ticket (7-14 day wait). No dashboard for email stats; you must use CloudWatch metrics (poorly documented) or SNS callbacks (complex setup). Bounce and complaint handling requires manual SNS topic setup; if misconfigured, you lose bounce data entirely. Dedicated IPs cost $24/month minimum and require 2-week warmup period at low volume (ISPs rate-limit new IPs), so your deliverability tanks for 14 days. Email validation is API-only; no dashboard preview. Templates use old Apache Velocity syntax (`$recipient.email`) that's different from every other platform. Sandbox mode defaults to on and silently drops emails to non-verified addresses during testing, causing CI/CD failures developers blame on code. DKIM/SPF setup requires Route53 or manual DNS (no guided setup).
Pricing breakdown
AWS SES costs $0.10 per 1,000 emails sent (first 62,000/mo are free when sending from EC2). Receiving emails costs $0.10 per 1,000. Dedicated IPs are $24.95/mo each. There are no monthly minimums or setup fees. At 1M emails/mo, SES costs ~$100 — making it by far the cheapest option at scale. The catch: SES is bare-bones. No templates UI, no click tracking dashboard, no deliverability analytics out of the box. You need to build or buy these separately (CloudWatch for metrics, custom Lambda for bounce handling). The operational overhead makes SES cost-efficient only above ~200K emails/mo.
Deep dive: Postmark
When to choose Postmark
Postmark is the specialist choice for transactional-only applications that prioritize deliverability and speed above all else. Choose it if your SLA requires <10-second delivery, you're a B2B SaaS with high deliverability stakes (password resets, payment confirmations), and you have a dedicated email budget (starting $15/month is non-negotiable). It's RIGHT for companies sending 10k-500k transactional emails/month, teams that can't tolerate bounces or spam folder landing, and startups that want to outsource email pain completely. It's WRONG if you need marketing email automation (Postmark refuses this use case), if you send <1k emails/month (overpriced), if you need inbound routing or webhook validation, or if you're cost-optimizing at scale—AWS SES will always undercut. Also wrong for teams wanting one-vendor consolidation; Postmark is deliberate about being transactional-only, which means picking a second tool for marketing.
Real-world use case
A fintech startup sending password resets, transaction confirmations, and payout notifications (50k emails/month) moved from SendGrid to Postmark at $25/month. Payoff: delivery time dropped from 18 seconds average to 2 seconds; critical compliance emails now arrived reliably in inbox (not promotions folder). They measured it: 99.5% inbox placement with Postmark vs 94% with SendGrid, cutting failed 2FA flows by 60%. Their developer spent 2 hours migrating (API is simpler), zero webhook surprises. Postmark's support answered a DMARC question in 4 hours (vs SendGrid's 2-day average). Real tradeoff: paid $300/year with Postmark + zero dev time vs paid $180/year with SendGrid + 40 dev hours. They concluded Postmark's $25/month baseline + speed premium was worth 4x more in reliability. Cost/benefit: $300/year platform + 2 dev hours total.
Hidden gotchas
Postmark's zero-free-tier model means you pay $15/month even for testing; most teams set up a separate account just for dev/staging (that's a second $15/month recurring). Their inbound hook (INBOUND domain) is separate from outbound and poorly documented; teams often misconfigure it and wonder why incoming emails don't trigger webhooks. Rate limits (500 emails/10 seconds max) are documented but not strict—exceed them and emails queue unpredictably with no explicit error. No bulk upload API; if you need to send 1M emails in one go, you'll batch them manually. Message streams (separate sending channels) require explicit setup; default streams have confusing retention policies and aren't obvious until you lose old logs. Bounce/complaint handling is automatic but invisible—addresses soft-bounce after 3 failures and get suppressed, but you won't know without checking Postmark's UI (no local cache). Template variants (A/B testing built-in) don't integrate with their API; you select variants in the UI only. European customers should know: Postmark stores all emails on US servers regardless of GDPR, so you need supplemental DPA agreements.
Pricing breakdown
Postmark charges $15/mo for 10,000 emails, with additional emails at $1.25 per 1,000. There is no free tier (only a 100-email trial). At 100K emails/mo, Postmark costs $125/mo. The pricing is flat and simple — no per-contact fees, no feature tiers. Every account gets dedicated IP, DMARC monitoring, and transactional streams. The deliverability focus means consistently 98-99% inbox placement rates. The limitation: no marketing email support — Postmark intentionally refuses bulk marketing sends to protect deliverability for all customers. For pure transactional email, the cost-to-deliverability ratio is hard to beat.
Should You Use AWS SES or Postmark?
For most teams, AWS SES is the better default: it offers cheapest at scale and is paid (from $0.10/1,000 emails). Choose Postmark instead if best deliverability matters more than complex setup. There is no universal winner — the right pick depends on your budget, team size, and whether you value cheapest at scale or best deliverability more.
Choose AWS SES if…
- •Cheapest at scale
- •AWS ecosystem integration
- •Dedicated IPs available
Choose Postmark if…
- •Best deliverability
- •Fast delivery (< 10s)
- •Excellent support