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MailerSend vs Mailgun

MailerSend lands on Worth it, and Mailgun lands on Depends.

Mailgun

mailgun.com

Depends
Confidence: Medium

Buy if you're a dev team sending high-volume transactional email and want APIs plus deliverability and validation tooling.

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MailerSend versus Mailgun
CompareMailerSendMailgun
VerdictWorth itDepends
Best forDevelopers adding transactional email APIsDev teams sending app email
Who it's not forMarketing newsletter sendersNon-technical marketers wanting drag-and-drop campaigns
PrivacyCore platform looks solid; the official WordPress SMTP plugin had a fixed CSRF vulnerability.⁹No breaches found in reviewed sources; vendor runs a public security portal and published a Log4j mitigation response.
Support quality24/7 support promised; approval rejections handled poorlyThird-party reviews flag suspensions and billing surprises
Public sentimentReviewers praise easy setup and low prices, but Reddit users complain about opaque sign-up rejections and some churn to simpler options.¹Developers report it works fine via SMTP and API, while third-party reviews flag billing surprises and suspensions.
Biggest gotchaWordPress plugin users must update past 1.0.8 to patch CSRF⁹Users report pricing escalation and unpredictable overage costs as volume grows

Pick MailerSend when

  • Developers adding transactional email APIs
  • WordPress sites needing SMTP relay
  • Budget-conscious SaaS teams
  • Startups starting on the free tier

When MailerSend is not a fit

  • Marketing newsletter senders
  • Buyers who can't tolerate opaque onboarding
  • Self-hosters avoiding third-party senders
  • Devs prioritizing developer-experience polish over price

Pick Mailgun when

  • Dev teams sending app email
  • High-volume transactional senders
  • API/SMTP integration shops
  • Teams needing deliverability and validation tooling

When Mailgun is not a fit

  • Non-technical marketers wanting drag-and-drop campaigns
  • Tiny side projects . cheaper alternatives exist
  • Budget-sensitive senders who can't absorb overage surprises
  • Anyone unwilling to manage DNS and sending reputation

Sources

  1. MailerSend Review 2026: Is It Worth It for WordPress?wpmailsmtp.com
    review
  2. MailerSend Review 2026: I Tested Its API, SMTP & Moreemailvendorselection.com
    review
  3. MailerSend Reviews 2026 - G2g2.com
    review
  4. MailerSend Software Pricing, Alternatives & More - Capterracapterra.com
    review
  5. MailerSend, Inc. Reviews - Trustpilottrustpilot.com
    review
  6. MailerSend pricing - MailerLitemailerlite.com
    official
  7. Plans, features and limits - MailerSend Helpmailersend.com
    official
  8. MailerSend Product security pagemailersend.com
    official
  9. CVE-2026-13156 - CVE Recordcve.org
    security
  10. MailerSend Official SMTP Integration <= 1.0.7 - CSRF - Wordfencewordfence.com
    security
  11. MailerSend vs Postmark - Reddit r/Wordpressreddit.com
    review
  12. SendGrid/MailerSend - failed sign-up - Reddit r/AskProgrammingreddit.com
    review
  13. I recently switched over to MailerSend - Hacker Newsnews.ycombinator.com
    review
  14. Email sender services - Reddit r/webdevreddit.com
    review
  15. Looking for alternative to MailerSend - Reddit r/mspreddit.com
    review
  16. MailerSend - Transactional email service that keeps it Lite - MailerLitemailerlite.com
    official