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Documented scope and limits; unverified dimensions remain unknown.
Requirement	Brevo Transactional Email	Postmark
Pricing	From $9/mo Compare all 5 plans	From $15/mo Compare all 5 plans
Who it is for	Transactional email sent by API or SMTP from your application, inside an all-in-one platform that also runs marketing campaigns. Verified Oct 11, 2026 · Brevo Transactional 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	Attachments are limited to 25 MB per email, and one API request can batch up to 1,000 emails. Verified Oct 11, 2026 · Brevo Transactional Email: official product and plan documentation	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	Plans are priced on emails sent; contact-based pricing applies only to marketing features. Verified Oct 11, 2026 · Brevo Transactional Email: official product and plan documentation Free 300 emails per day Starter 5,000 emails per month Standard 5,000 emails per month Professional 150,000 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	Not verified	Free 10 custom sending domains Basic 5 custom sending domains Pro 10 custom sending domains Platform Unlimited custom sending domains
Log retention	Flexible log retention is advertised; a numeric retention window is not stated on this page. Verified Oct 11, 2026 · Brevo Transactional Email: official product and plan documentation	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	Event webhooks and real-time tracking are listed. Verified Oct 11, 2026 · Brevo Transactional Email: official product and plan documentation Free Webhook support 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	Dedicated IPs with custom warming schedules are offered to high-volume senders; no price is published. Verified Oct 11, 2026 · Brevo Transactional Email: official product and plan documentation Enterprise Dedicated IPs are part of the custom Enterprise plan	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 Email support Starter Email support in 6 languages Professional Phone support plus 3 hours a year with a deliverability specialist Enterprise Tailored onboarding and CSM support	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	Pay-as-you-go email credits are an alternative to a plan: they do not expire and one email uses one credit. Pay-as-you-go does not include phone support; the credit price is not shown. Verified Oct 11, 2026 · Brevo: official pricing page	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	Starting volume.	Starting tier; unlimited emails per day. Not listed on the Basic card.