documentTHE COMPARISON DESK
Every detail. Side by side.
Compare the full collection or build a shortlist. Each sourced fact describes the stated plan or scope, not a promise that every tier includes it.
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SLA ≠ measured uptime. Prices use different billing units. Read the comparison notes →
| Comparison field | PostmarkDeveloper platforms |
|---|---|
| PricingBilling model | Monthly card billing; no annual plansSource ↗ |
| PricingSelected paid rateSelected plans, not equivalent baskets. USD unless stated; taxes, add-ons and regional terms may differ. | 10k/month: Basic USD 15; Pro USD 16.50; Platform USD 18Source ↗ |
| PricingFree tier / trial | Developer plan: 100 emails/monthSource ↗ |
| PricingOverage | Per 1,000 above allowance; Basic example USD 1.80. Exact rate depends on tier.Source ↗ |
| PricingData / attachment charges | Not stated in reviewed docs Review detailsReviewed pricing does not establish a separate data or attachment transfer rate. This is not confirmation that all such charges are zero. Reviewed 2026-09-08 Reviewed source 1 ↗ |
| PricingWhat counts as an email | Statistics count each recipient separately; Messages API TotalCount instead counts one multi-recipient message.Source ↗ |
| PricingCredit expiry | Unused monthly email allocation does not roll over.Source ↗ |
| ReliabilityOfficial incident historyProvider-reported status, not independent monitoring or a live health indicator. | Official status pageOpen ↗ |
| ReliabilityContractual uptime SLAA service commitment, not observed uptime. Eligibility, exclusions and credit rules differ. | Not stated in reviewed docs Review detailsNo email-specific numerical contractual uptime commitment was established in the reviewed materials. Reviewed 2026-09-08 Reviewed source 1 ↗Reviewed source 2 ↗ |
| ReliabilityMeasured uptime | Not measured |
| ReliabilityMeasured delivery latency | Not measured |
| ReliabilityMeasured inbox placement | Not measured |
| Sending & featuresHTTP API | AvailableSource ↗ |
| Sending & featuresSMTP relay | AvailableSource ↗ |
| Sending & featuresSDKs | TypeScript/Node.js, Python, Ruby/Rails, .NET, Java, PHPSource ↗ |
| Sending & featuresTemplates / editor | Template sending APISource ↗ |
| Sending & featuresWebhooks | Delivery, bounce, open, click and inbound events documentedSource ↗ |
| Sending & featuresInbound processing | Pro / Platform include inbound processingSource ↗ |
| Sending & featuresCampaigns / automation | Separate transactional and broadcast message streamsSource ↗ |
| Sending & featuresAnalytics | Open and link trackingSource ↗ |
| Operations & securitySuppression management | Bounces and complaints retained in stream suppression listsSource ↗ |
| Operations & securityDaily / request limits | Paid sending continues beyond allowance; no user-set hard spending capSource ↗ |
| Operations & securityLog / activity retention | 45 days by default; retention add-on: 7–365 daysSource ↗ |
| Operations & securityDedicated IP | USD 50/IP/month; at least 300,000 messages/monthSource ↗ |
| Operations & securityHosting / region notes | Primary infrastructure: Chicago-area Deft and AWSSource ↗ |
| Operations & securitySending domains | Basic 5; Pro 10; Platform unlimitedSource ↗ |
| Operations & securitySender authentication | DKIM; default SPF; custom Return-Path for DMARC alignmentSource ↗ |
| Operations & securitySSO | Not stated in reviewed docs Review detailsExternal identity-provider SSO protocols and plan eligibility were not established for this product. Reviewed 2026-09-08 Reviewed source 1 ↗Reviewed source 2 ↗ |
| Operations & securitySupport channels | Support contact form; published hours Monday–Friday, 3am–7pm EST.Source ↗ |
| Operations & securitySetup requirements | Verify sender signature or domain, then configure authenticationSource ↗ |
| ResourcesWebsite | Official resourceOpen ↗ |
| ResourcesDocumentation | Official resourceOpen ↗ |
| ResourcesPricing page | Official resourceOpen ↗ |
Unconfirmed cells include review details and sources: documentation may omit a value, sources may conflict, or a current page may be unreadable. Not measured means no independent test dataset.