Mailgun alternatives,
compared
Mailgun is a long-standing email API built for volume. Teams look elsewhere when they also need campaigns and automation, or want to stop paying for a monthly tier they do not fill.
Why teams look beyond Mailgun
Tiered monthly plans
You pay for a volume tier each month, used or not, and move up as you grow.
Sending only
Campaigns, workflows and segments need a second tool alongside it.
Closed source
You cannot read the code or run it on your own servers.
6 alternatives to Mailgun
Plunk is first because we build it; the rest are in order of how often they fit teams leaving Mailgun. 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
- 2PostmarkTransactional emailTransactional email with message streams kept strictly separate.Monthly plans by email volume
- 3ResendEmail APIDevelopers who build emails with React Email and mostly send transactional email.Monthly plans; marketing priced per contact
- 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 Mailgun.
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.