Postmark alternatives,
compared
Postmark has a strong reputation for transactional delivery. Teams look elsewhere when they also need marketing email and automation, or want to pay per email instead of per plan.
Why teams look beyond Postmark
Transactional first
Broadcasts go out through the API, with no campaign builder, workflows or segments.
Monthly plans
You pay for a volume tier each month, used or not.
Closed source
You cannot read the code or run it on your own servers.
6 alternatives to Postmark
Plunk is first because we build it; the rest are in order of how often they fit teams leaving Postmark. Updated October 2026.
- 1Plunk(us)Open-source email platform · EUTransactional email, campaigns and workflows on one contact list, open source and hosted in the EU.$0.001 per email, unlimited contacts
- 2ResendEmail APIDevelopers who build emails with React Email and mostly send transactional email.Monthly plans; marketing priced per contact
- 3MailgunEmail APIHigh-volume sending with email validation and deliverability tooling.Monthly plans by email volume
- 4SendGridEmail API and marketingLarge teams already using Twilio for other messaging.Monthly plans by email volume
- 5Amazon SESSending infrastructureTeams that will build contacts, templates and tracking themselves.From $0.10 per 1,000 emails
- 6useSendOpen-source email APIOpen source with low-cost transactional sending at volume.Per email, with a $10 monthly minimum
Each row links to its full comparison with Plunk, or see every comparison
Frequently asked questions
Try Plunk alongside Postmark.
Start on the free plan with 1,000 emails a month, no credit card needed. When you need more, every email is $0.001, with unlimited contacts and every feature included.