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Documented scope and limits; unverified dimensions remain unknown.
Requirement	Elastic Email	Postmark
Pricing	From $19/mo Compare all 3 plans	From $15/mo Compare all 5 plans
Who it is for	Email API and SMTP relay for transactional emails, notifications and bulk sending from your own software. Verified Oct 11, 2026 · Elastic Email: official product and plan documentation	Sends transactional email and keeps bulk or broadcast email on separate Message Streams. Verified Oct 11, 2026 · Postmark: official product and plan documentation
Coverage limits	Starter does not list webhooks, inbound email processing or sub-accounts; only Pro adds them. Verified Oct 11, 2026 · Elastic Email API pricing, plan table and FAQ	There is no tier between the free 100 emails a month and the 10,000-email paid tier. Verified Oct 11, 2026 · Postmark: official product and plan documentation
Sending volume	Paid tiers run from 50,000 to 10,000,000 emails a month. Verified Oct 11, 2026 · Elastic Email API pricing, plan table and FAQ Free 3,000 emails per month Starter 50,000 emails per month Pro 50,000 emails per month	Unused emails do not roll over to the next billing period. Verified Oct 11, 2026 · Postmark: official product and plan documentation Free 100 emails per month Basic 10,000 emails per month Pro 10,000 emails per month Platform 10,000 emails per month
Sender domains	Sending from your own domain with DNS validation, SPF and DKIM is listed in the plan table. No domain limit is stated. Verified Oct 11, 2026 · Elastic Email API pricing, plan table and FAQ	Free 10 custom sending domains Basic 5 custom sending domains Pro 10 custom sending domains Platform Unlimited custom sending domains
Log retention	Free 3 days of email logs Starter 3 days of email logs Pro 7 days of email logs	Custom activity retention starts at USD 5 a month and is only available on Pro plans or higher; statistics are kept indefinitely. Verified Oct 11, 2026 · Postmark: official product and plan documentation Basic 45 days Pro Customizable up to 365 days; 45 days by default Platform Customizable up to 365 days; 45 days by default
Webhooks and events	Webhooks can report sends, opens, clicks, bounces, unsubscribes and other email events. Verified Oct 11, 2026 · Elastic Email: official product and plan documentation Pro Webhooks included	Inbound email is converted to JSON and posted to your webhook URL. Verified Oct 11, 2026 · Postmark: official product and plan documentation Pro Inbound email processing included Platform Inbound email processing included
Dedicated IP	Starter Private IP add-on: USD 40 a month Pro Private IP add-on: USD 50 a month	From USD 50 a month per IP, for accounts sending 300,000 or more emails a month on Pro or higher. Fully managed by Postmark. Verified Oct 11, 2026 · Postmark: official product and plan documentation
Support	Free support by in-app messenger or email, with a response expected within 24 hours; a paid Dedicated Support add-on shortens response times. The add-on price is not shown. Verified Oct 11, 2026 · Elastic Email API pricing, plan table and FAQ	Support requests are handled by the customer success team through support tickets. The pricing page lists no support level per plan. Verified Oct 11, 2026 · Postmark support centre
Overage charges	No per-email overage: on reaching the sending limit the plan upgrades automatically if auto-increase is on, or you upgrade manually. With auto-increase, the higher price applies only for the rest of the subscription period. Verified Oct 11, 2026 · Elastic Email API pricing, plan table and FAQ	Extra emails on paid plans are calculated at the end of the billing cycle and added to the next month's charge. Verified Oct 11, 2026 · Postmark: official product and plan documentation Free No overages are allowed on Free.
Coverage note	The table shows two prices for the two paid plans. At the price shown; larger tiers are selected on the slider.	Starting tier; unlimited emails per day. Not listed on the Basic card.