Mailgun Alternatives for Email Deliverability

Looking for a Mailgun alternative? First check whether the problem is your sending platform or your DNS authentication.

Important distinction: If emails sent through Mailgun are going to spam, the cause is often not Mailgun itself - it is misconfigured SPF, DKIM, or DMARC DNS records on your domain. Switching to another sending service will not fix a DNS authentication problem because those records follow your domain, not your sending platform. Before migrating, check whether your domain authentication is the actual issue.

Check your DNS before switching platforms

Deliverability problems that look like a Mailgun issue are often actually a DNS problem. If SPF does not include include:mailgun.org, DKIM records are not published, or DMARC is missing, your emails will land in spam regardless of which sending platform you move to.

Run a free InboxGreen check on your sending domain to rule out DNS authentication issues before investing time in a platform migration.

search Check My Domain Free

Mailgun alternatives for email sending

If you have confirmed your DNS is correct and the issue is with the sending platform itself, here are the main alternatives:

Service Best for Free tier Paid pricing
Postmark Transactional email with the best delivery speed and reliability 100 emails/month From $15/mo (10k emails)
SendGrid High-volume sending with marketing campaign tools included 100 emails/day From $19.95/mo (50k emails)
Amazon SES Lowest cost at scale - requires more setup and AWS familiarity 3,000 emails/day (from EC2) $0.10 per 1,000 emails
Resend Developer-friendly modern API, React email template support 3,000 emails/month From $20/mo (50k emails)
Brevo (ex-Sendinblue) Marketing and transactional email in one platform with CRM features 300 emails/day From $25/mo (20k emails)
SparkPost / MessageBird Enterprise-grade sending with advanced analytics and predictive deliverability 500 emails/month From $20/mo (50k emails)

What to update when moving away from Mailgun

When you migrate from Mailgun to any other sending platform, three things in DNS must change:

Update SPF record

Remove include:mailgun.org from your SPF record and add your new provider's include. If you had a Mailgun subdomain like mg.yourdomain.com, remove the SPF record from that subdomain too.

Replace DKIM records

Delete the Mailgun DKIM CNAME or TXT records and publish the new provider's DKIM records. Use the DKIM Checker to verify the new records are live.

Verify DMARC passes

After updating SPF and DKIM, confirm DMARC alignment passes with your new setup. Use the DMARC Analyzer to verify.

How InboxGreen helps when migrating from Mailgun

  • Check your current SPF, DKIM, and DMARC before migrating so you know your starting point.
  • After migration, verify the new sending platform's DKIM records are published and SPF is updated correctly.
  • Get copy-paste DNS records formatted for Cloudflare, Namecheap, GoDaddy, or your specific DNS provider.
  • Set up ongoing monitoring so you are alerted immediately if records break during or after the migration.
search Run Free Domain Check

Frequently asked questions

Will switching from Mailgun to Postmark or SendGrid fix my deliverability?

It depends on the root cause. If SPF, DKIM, or DMARC are misconfigured, the same DNS authentication problems will follow your domain to any new platform. If the issue is Mailgun's shared IP reputation, rate limits, or a suspended account, switching platforms may help. Run an InboxGreen check to diagnose the DNS side before migrating.

What should my SPF record include after moving from Mailgun?

Remove include:mailgun.org and add the include for your new provider. Common examples: include:spf.postmarkapp.com for Postmark, include:sendgrid.net for SendGrid, include:amazonses.com for Amazon SES. Use the SPF Generator to rebuild the record cleanly with the correct syntax.

Is Mailgun free?

Mailgun offers a trial period with 100 emails/day (5,000 total). After the trial, you need a paid plan starting from $15/month for 50,000 emails. Mailgun no longer offers a permanent free tier the way it used to. If cost is the main driver, Amazon SES at $0.10 per 1,000 emails is the lowest-cost alternative at scale.

Why do emails from my new platform still go to spam after migrating from Mailgun?

After switching, confirm that the new DKIM records are published and resolving, SPF includes the new provider, and DMARC is passing. New or cold sending IPs also need an IP warming period - spam folders are common during the first few weeks even with correct authentication. Run an InboxGreen check to rule out DNS issues first.

Does Mailgun include email authentication tools?

Mailgun's domain verification panel checks whether DKIM records you published are resolving and detects basic SPF configuration. It does not check your full DMARC setup, does not generate copy-paste DNS records for your specific provider, and does not offer ongoing monitoring or alerts. InboxGreen fills all of these gaps and works alongside any sending platform.