Free Mailgun alternatives: 7 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rank

7 of the 8 Mailgun alternatives we track can be used for free (free, open source, or with a free plan). Postmark, Elastic Email and Resend rank highest, with facts last verified Nov 8, 2026.

Quick comparison

#	App	Pricing	Verified price	Open source	Platforms	Verified facts	Score
1	Postmark	Free plan + paid	$15 a month (Basic, 10,000 emails)	No	Web	6 of 6	64.8
2	Elastic Email	Free plan + paid	$29/month for 2,500 contacts	No	Web	4 of 4	64.0
3	Resend	Free plan + paid	$20 a month for 50,000 emails (Pro)	No	Web	6 of 6	59.4
4	Mailjet	Free plan + paid	$9 a month (Starter, 8,000 emails/month)	No	Web	6 of 6	52.6
5	Brevo	Free plan + paid	$9 a month for 5,000 emails	No	Web, iOS, Android	5 of 5	50.0
6	SMTP2GO	Free plan + paid	$10 a month billed annually ($100/year), 10,000 emails	No	Web	7 of 7	42.3
7	MailerSend	Free plan + paid	$68/month for 100,000 emails	No	Web	5 of 5	42.3

1. PostmarkTop pick
Best for: SaaS teams that care most about fast, reliable delivery of password resets and receipts
Free plan + paidWeb
64.8
score / 100
Why switch from Mailgun
Narrower focus on transactional speed with clear per-email pricing.
Pros
Transactional and bulk mail kept in separate streams
Clear published pricing with unlimited daily sending
Inbound email processing on the Pro tier and above
Searchable activity logs with adjustable retention
Cons
Free plan allows only 100 emails a month
Less suited to large marketing newsletters
Fewer custom sending domains on the cheapest plan
Visit Postmark Details and reviews
How this score is calculated
Editorial fit ×0.387
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Postmark a good Mailgun alternative?
Verified facts
6 of 6 verified
Free plan
Yes, 100 emails a month
Checked Nov 8, 2026postmarkapp.com(opens source in a new tab)
Starting price
$15 a month (Basic, 10,000 emails)
Checked Nov 8, 2026postmarkapp.com(opens source in a new tab)
Data retention
45 days default, up to 365
Checked Nov 8, 2026postmarkapp.com(opens source in a new tab)
Daily limit
Unlimited emails/day on paid plans
Checked Nov 8, 2026postmarkapp.com(opens source in a new tab)
Pro plan
$16.50 a month (10,000 emails)
Checked Nov 8, 2026postmarkapp.com(opens source in a new tab)
Platform plan
$18 a month (10,000 emails)
Checked Nov 8, 2026postmarkapp.com(opens source in a new tab)
2. Elastic Email
Best for: Cost-conscious senders and agencies who want marketing and API sending in one account
Free plan + paidWeb
64.0
score / 100
Why switch from Mailgun
Lower-cost sending API with pay-as-you-go pricing for teams sending in bulk.
Pros
Very low prices for marketing and API sending
Marketing platform and email API in one account
Email verification and sub-accounts included
Cons
Interface less polished than leading tools
Automations only on higher plans
Mixed reviews of support
Visit Elastic Email Details and reviews
How this score is calculated
Editorial fit ×0.334
Reviews ×0.363
Clicks (90 days) ×0.15100
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Elastic Email a good Mailgun alternative?
Verified facts
4 of 4 verified
Free plan
1,000 contacts, 3,000 emails/month
Checked Nov 8, 2026elasticemail.com(opens source in a new tab)
Starter price
$29/month for 2,500 contacts
Checked Nov 8, 2026elasticemail.com(opens source in a new tab)
Pro price
$49/month for 2,500 contacts
Checked Nov 8, 2026elasticemail.com(opens source in a new tab)
Pro features
Automations, paid newsletters, checkouts
Checked Nov 8, 2026elasticemail.com(opens source in a new tab)
3. Resend
Best for: Developers and startups who want a modern email API with React-based templates
Free plan + paidWeb
59.4
score / 100
Why switch from Mailgun
Developer-first email API with React Email templates and a simpler dashboard, plus a free tier.
Pros
Simple REST API plus SMTP relay and official SDKs
React Email templates fit naturally into JavaScript codebases
Free plan is enough for side projects and testing
Transactional and broadcast email in one account
Cons
Free plan is capped at 100 emails a day
Dedicated IPs and SSO cost extra add-ons
Younger service with fewer marketing features than full email marketing suites
Visit Resend Details and reviews
How this score is calculated
Editorial fit ×0.369
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Resend a good Mailgun alternative?
Verified facts
6 of 6 verified
Free plan
Yes, 3,000 emails a month (100 a day)
Checked Nov 8, 2026resend.com(opens source in a new tab)
Starting price
$20 a month for 50,000 emails (Pro)
Checked Nov 8, 2026resend.com(opens source in a new tab)
Sending methods
REST API and SMTP relay
Checked Nov 8, 2026resend.com(opens source in a new tab)
Free trial
No, free-forever plan instead
Checked Nov 8, 2026resend.com(opens source in a new tab)
Dedicated IP
$30/month add-on
Checked Nov 8, 2026resend.com(opens source in a new tab)
Scale plan
$90 a month for 100,000 emails
Checked Nov 8, 2026resend.com(opens source in a new tab)
4. Mailjet
Best for: Teams that need marketing and transactional email together, with collaborative editing
Free plan + paidWeb
52.6
score / 100
Why switch from Mailgun
Sister product from Sinch with a visual editor for marketing email.
Pros
Marketing and transactional email in one account
Real-time collaboration and approval workflows
Volume-based pricing with a free plan
Cons
Free plan has a daily send cap
Basic automation
Limited support on lower tiers
Visit Mailjet Details and reviews
How this score is calculated
Editorial fit ×0.346
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Mailjet a good Mailgun alternative?
Verified facts
6 of 6 verified
Free plan
Yes, 6,000 emails/month (200 per day)
Checked Nov 8, 2026mailjet.com(opens source in a new tab)
Free plan card
No credit card required
Checked Nov 8, 2026mailjet.com(opens source in a new tab)
Starter plan
8,000 emails/month, no daily limit
Checked Nov 8, 2026mailjet.com(opens source in a new tab)
Starting price
$9 a month (Starter, 8,000 emails/month)
Checked Nov 8, 2026mailjet.com(opens source in a new tab)
Essential plan
$19 a month, 15,000 emails/month
Checked Nov 8, 2026mailjet.com(opens source in a new tab)
Premium plan
$29 a month, 15,000 emails/month
Checked Nov 8, 2026mailjet.com(opens source in a new tab)
5. Brevo
Best for: Businesses with large contact lists that want email, SMS and a CRM in one place
Free plan + paidWeb, iOS, Android
50.0
score / 100
Why switch from Mailgun
Transactional SMTP and API on the same account as your marketing email, priced by volume.
Pros
Priced by emails sent, not contacts stored
Email, SMS, WhatsApp and transactional email together
Free plan with daily sending allowance
Cons
Free plan has a daily send limit and branding
Editor and templates less polished than some rivals
SMS credits cost extra
Visit Brevo Details and reviews
How this score is calculated
Editorial fit ×0.338
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Brevo a good Mailgun alternative?
Verified facts
5 of 5 verified
Free plan
Yes, up to 300 emails per day
Checked Nov 8, 2026brevo.com(opens source in a new tab)
Free plan terms
Free forever, no card needed
Checked Nov 8, 2026brevo.com(opens source in a new tab)
Starter volume
From 5,000 emails per month
Checked Nov 8, 2026brevo.com(opens source in a new tab)
Transactional messaging
Email, SMS and WhatsApp via SMTP and API
Checked Nov 8, 2026brevo.com(opens source in a new tab)
Starting price
$9 a month for 5,000 emails
Checked Nov 8, 2026brevo.com(opens source in a new tab)
6. SMTP2GO
Best for: Small businesses, MSPs and IT admins who need a reliable SMTP relay for apps, servers and devices
Free plan + paidWeb
42.3
score / 100
Why switch from Mailgun
Straightforward SMTP relay with automatic SPF and DKIM and subaccounts for MSPs.
Pros
Permanent free plan for low volumes
SPF and DKIM handled automatically
Subaccounts suited to managed service providers
Ticket, chat and phone support on paid plans
Cons
Free plan caps at 1,000 emails a month
Phone and chat support are limited to 14 days on the free plan
Signup rejects addresses at public domains like Gmail
Visit SMTP2GO Details and reviews
How this score is calculated
Editorial fit ×0.312
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is SMTP2GO a good Mailgun alternative?
Verified facts
7 of 7 verified
Free plan
Yes, up to 1,000 emails a month
Checked Nov 8, 2026smtp2go.com(opens source in a new tab)
Refund guarantee
30 days
Checked Nov 8, 2026smtp2go.com(opens source in a new tab)
Customers
40,000+ businesses
Checked Nov 8, 2026smtp2go.com(opens source in a new tab)
SPF/DKIM
Automatic
Checked Nov 8, 2026smtp2go.com(opens source in a new tab)
Infrastructure
Multi data center, redundant
Checked Nov 8, 2026smtp2go.com(opens source in a new tab)
Starting price
$10 a month billed annually ($100/year), 10,000 emails
Checked Nov 8, 2026smtp2go.com(opens source in a new tab)
Professional plan
$75 a month billed annually ($750/year), 100,000 emails
Checked Nov 8, 2026smtp2go.com(opens source in a new tab)
7. MailerSend
Best for: SaaS and ecommerce teams who want an email API plus templates non-developers can edit
Free plan + paidWeb
42.3
score / 100
Why switch from Mailgun
Adds visual template editors and DMARC monitoring alongside the API.
Pros
Free plan for testing and small senders
Visual template editors alongside the API and SMTP relay
Built-in inbound routing, email verification and DMARC monitoring
Unused trial ends on the free plan, with no automatic charge
Cons
Free plan needs a credit card and has tight daily API limits
SMS sending only works in the US and Canada
Dedicated IPs are reserved for high-volume enterprise accounts
Visit MailerSend Details and reviews
How this score is calculated
Editorial fit ×0.312
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is MailerSend a good Mailgun alternative?
Verified facts
5 of 5 verified
Free plan
500 emails/month
Checked Nov 8, 2026mailersend.com(opens source in a new tab)
Free trial
14 days of Professional
Checked Nov 8, 2026mailersend.com(opens source in a new tab)
Starter plan
$68/month for 100,000 emails
Checked Nov 8, 2026mailersend.com(opens source in a new tab)
Nonprofit discount
30%
Checked Nov 8, 2026mailersend.com(opens source in a new tab)
SMS coverage
USA and Canada only
Checked Nov 8, 2026mailersend.com(opens source in a new tab)

Quick comparison

1. PostmarkTop pick

Pros

Cons

Verified facts

2. Elastic Email

Pros

Cons

Verified facts

3. Resend

Pros

Cons

Verified facts

4. Mailjet

Pros

Cons

Verified facts

5. Brevo

Pros

Cons

Verified facts

6. SMTP2GO

Pros

Cons

Verified facts

7. MailerSend

Pros

Cons

Verified facts