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Documented scope and limits; unverified dimensions remain unknown.
Requirement	MailerSend	Postmark
Pricing	From $7/mo Compare all 4 plans	From $15/mo Compare all 5 plans
Who it is for	Email API and SMTP relay for sending email, from a free 500-email plan upward. Verified Oct 11, 2026 · MailerSend pricing, monthly plan cards and comparison table	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	Daily API requests are capped by plan: 100 on Free, 1,000 on Hobby, 100,000 on Starter and 500,000 on Professional. Table columns run Professional, Starter, Hobby, Free. Verified Oct 11, 2026 · MailerSend pricing, monthly plan cards and comparison table	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	Free 500 emails per month Hobby 5,000 emails per month Starter 50,000 emails per month Professional 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	An extra domain space costs USD 4.00; the billing period is not stated. Available on Starter, Professional and Enterprise. Verified Oct 11, 2026 · MailerSend pricing, monthly plan cards and comparison table Free 1 sending domain Hobby 1 sending domain Starter 10 sending domains Professional Unlimited, subject to the plan-limits policy	Free 10 custom sending domains Basic 5 custom sending domains Pro 10 custom sending domains Platform Unlimited custom sending domains
Log retention	Searchable activity data can be extended up to 365 days, from USD 5.00. Verified Oct 11, 2026 · MailerSend pricing, monthly plan cards and comparison table Free 1 day of activity data Hobby 1 day of activity data Starter 7 days of activity data Professional 30 days of activity data	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	Free 1 webhook Hobby 1 webhook Starter 50 webhooks Professional Unlimited, subject to the plan-limits policy	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 are only for Enterprise accounts sending more than 100,000 emails a week. Verified Oct 11, 2026 · MailerSend pricing, monthly plan cards and comparison table	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 Limited Hobby Email support Starter Email and live chat support Professional Priority email support, live chat and onboarding assistance	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	Sending continues past the monthly quota and extra emails are billed per 1,000; the email count resets every 30 days. Verified Oct 11, 2026 · MailerSend: official product and plan documentation	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	At the volume shown on the plan card.	Starting tier; unlimited emails per day. Not listed on the Basic card.