shouldiuse.io

New check

Comparison

Mailster vs Sender

Mailster lands on Depends, and Sender lands on Worth it.

Sender

sender.net

Worth it
Confidence: Medium

Buy if you're a small business or startup wanting affordable email marketing with automation . the free tier is genuinely usable at 2,500 subscribers.

Read the full report

Mailster versus Sender
CompareMailsterSender
VerdictDependsWorth it
Best forSmall WordPress sitesSmall businesses on a budget
Who it's not forHigh-volume senders needing managed deliverabilityEnterprises needing complex lifecycle orchestration . reviewers call Sender an entry point
PrivacySeveral reported vulnerabilities (reflected XSS, local file inclusion) around v4.0.6; keep the plugin updated.⁹One SQL injection CVE (2026-59537) affects the Sender WordPress plugin; no public security page found.
Support qualityUsers report weeks-long support waits24/7 support advertised; Trustpilot feedback present
Public sentimentUsers praise the value for the price and ease of use, but some report support delays and weigh it against standalone email services.Users on G2, Capterra, Trustpilot and independent blogs consistently praise value and ease of use; notable criticisms are sparse in available snippets.
Biggest gotchaOwnership changed hands; verify update cadence before committing.⁸CVE-2026-59537: SQL injection in the Sender WordPress newsletter plugin . update or remove it.

Pick Mailster when

  • Small WordPress sites
  • Budget-conscious newsletter senders
  • Bloggers wanting in-dashboard sending
  • Buyers who hate subscriptions

When Mailster is not a fit

  • High-volume senders needing managed deliverability
  • Non-WordPress sites
  • Teams wanting vendor-run infrastructure and SLAs
  • Anyone unwilling to maintain plugin updates

Pick Sender when

  • Small businesses on a budget
  • Startups growing an email list under 2,500
  • Ecommerce stores needing basic automation
  • WordPress sites (plugin available)

When Sender is not a fit

  • Enterprises needing complex lifecycle orchestration . reviewers call Sender an entry point
  • High-volume senders needing dedicated IPs and deliverability engineering
  • Teams requiring SOC 2 or published security documentation
  • Buyers wanting multi-seat collaboration . Standard tier has just 3 role seats

Sources

  1. Mailster official sitemailster.co
    official
  2. Mailster pricing pagemailster.co
    official
  3. Mailster templates (400+)mailster.co
    official
  4. WP Mayor Mailster reviewwpmayor.com
    review
  5. Mailster vs Mailchimp cost comparisoninboxreads.co
    review
  6. Reddit: Email marketing recommendationsreddit.com
    review
  7. WordPress.org support: Awful performance and supportwordpress.org
    review
  8. Sender.net: WordPress email marketing (ownership change)sender.net
    news
  9. Patchstack: Mailster 4.0.6 reflected XSSpatchstack.com
    security
  10. Acunetix: Mailster 4.0.6 local file inclusionacunetix.com
    security
  11. Alternatives.co Mailster pricingalternatives.co
    review
  12. Blogvault: MailPoet vs Mailsterblogvault.net
    review
  13. Sender . official site and pricingsender.net
    official
  14. Sender Review (2026): 12 Months In Useencharge.io
    review
  15. Sender review 2026 . TechRadartechradar.com
    review
  16. Sender Review: Is It the Best Email Marketing Software?onsaas.me
    review