{"name":"Postmark","slug":"postmark","category":"email","type":"cloud","website":"https://postmarkapp.com","pricing":"paid","pricing_tiers":["$15/mo (10k emails)","$50/mo (50k emails)","$100/mo (125k emails)","Custom high volume"],"open_source":false,"self_hosted":false,"sdk_languages":["python","javascript","ruby","java","csharp","php"],"frameworks":[],"agent_features":{"transactional":true,"marketing":false,"inbound_parsing":true,"template_engine":true,"deliverability_tools":true},"compliance":["soc2","gdpr"],"best_for":"Best-in-class transactional email deliverability — fast inbox delivery times and transparent uptime reporting","limitations":"No free tier; strictly transactional email only — no marketing or bulk email; fewer SDK languages than SendGrid","verified_by":"editorial","last_verified":"2026-04-28","source_urls":{"docs":"https://postmarkapp.com/developer","pricing":"https://postmarkapp.com/pricing"},"feature_labels":{"transactional":"Send triggered emails — receipts, notifications, approval requests","marketing":"Send bulk campaigns and newsletters","inbound_parsing":"Receive and parse incoming emails via webhook","template_engine":"Built-in email template builder or rendering engine","deliverability_tools":"Dedicated IP, domain authentication, and reputation monitoring"},"comparisons":[{"slug":"aws-ses-vs-postmark","title":"AWS SES vs Postmark","vs":"aws-ses"},{"slug":"mailgun-vs-postmark","title":"Mailgun vs Postmark","vs":"mailgun"},{"slug":"postmark-vs-resend","title":"Postmark vs Resend","vs":"resend"},{"slug":"postmark-vs-sendgrid","title":"Postmark vs SendGrid","vs":"sendgrid"}],"body":"# Postmark\n\nPostmark (by ActiveCampaign) is focused exclusively on transactional email. It consistently ranks among the fastest for inbox delivery times and publishes real-time delivery stats publicly.\n\nThe deliberate choice to not support marketing email means Postmark's IP reputation stays clean. For agent workflows that send critical notifications — approval requests, alerts, summaries — delivery speed and reliability matter more than volume pricing."}