2026 comparison: 8 free SMTP plugins for WordPress
Comparison table of the 8 most-used free SMTP plugins for WordPress in 2026, evaluating security, presets, logs and use cases. Includes aGo SMTP.
Comparison table of the 8 most-used free SMTP plugins for WordPress in 2026, evaluating security, presets, logs and use cases. Includes aGo SMTP.
wp_mail() fails silently on many shared hosts. Without real SMTP, contact emails, password resets, WooCommerce transactional mail and newsletters do not reach the inbox. Here is the 2026 comparison of the 8 most-used free SMTP plugins for WordPress.
Quick comparison
| Plugin | Presets | Password encryption | Email log | DNS check | OAuth | Notes |
|---|---|---|---|---|---|---|
| aGo SMTP | 8 | AES-256 | Last 50 | Yes | No | Pure GPL, no upsell |
| WP Mail SMTP Lite | 6 | Base64 | Limited (Pro) | Pro only | Pro | Constant upsell |
| FluentSMTP | 7 | Encryption | Yes | No | Yes | Broad Pro tier |
| Easy WP SMTP | 4 | Plain text | Limited | No | No | Legacy, old |
| Post SMTP | 5 | Encryption | Yes | No | Yes | Solid open source |
| Send Email Counter | 0 | Does not send | Yes (counter only) | No | No | Logs only, does not send |
| Mail Bank | 2 | Plain text | No | No | No | Abandoned |
| BWS SMTP | 4 | Base64 | No | No | No | Basic |
Criteria that matter
1. Password encryption
The SMTP password is stored in the database. If the plugin stores it in plain text or Base64, an attacker who reaches the database reads it. AES-256 is the serious standard. aGo SMTP, FluentSMTP and Post SMTP encrypt correctly.
2. Provider presets
Manually configuring Gmail/Outlook/SendGrid is error-prone. Presets autofill host, port and correct TLS/SSL. More presets means fewer mistakes.
3. Email log
Knowing whether emails were sent and to whom is critical. Plugins without log or with “Pro only” log leave you blind when a client says “I never got it”.
4. DNS health check
Validating SPF, DKIM and DMARC for your domain before sending avoids spam folder. aGo SMTP includes it free (WP Mail SMTP charges it as Pro).
5. OAuth for Google Workspace
If your SMTP is plain Gmail (smtp.gmail.com plus app password), you do not need OAuth. If you want to use enterprise Google Workspace without an app password, OAuth is required (FluentSMTP, Post SMTP, WP Mail SMTP Pro).
Which one to pick?
If your hosting is shared with simple Gmail/Outlook/SendGrid SMTP
aGo SMTP. Free, AES-256, 8 presets, DNS check, log. No upsell. Decision over.
If you need OAuth for enterprise Google Workspace without app password
FluentSMTP (free includes OAuth) or Post SMTP. If you are paying, WP Mail SMTP Pro also covers this.
If you only want to know whether emails are being sent (not to send them)
Send Email Counter. It does not replace SMTP, only counts and logs what wp_mail() sends.
FluentSMTP (free includes OAuth) or Post SMTP.
How to configure SMTP in 3 minutes with aGo SMTP
- WordPress → Plugins → Add new → search “aGo SMTP” → Install → Activate.
- Settings → aGo SMTP → pick a preset (e.g. Gmail).
- Paste your email and app password (Gmail) or API key (SendGrid).
- “Test email” button → verify it arrives.
- DNS health check shows whether your SPF/DKIM/DMARC are correct.
Full aGo SMTP spec · Detailed comparison vs WP Mail SMTP.
Conclusion
For 90% of WordPress sites, aGo SMTP solves the problem free and well. Pro plugins start to justify themselves when you need OAuth Google Workspace or centralized logs across many sites. If that is not your case, do not pay USD 100+/year for something that works free.
Implementation questions? aGo WordPress services cover complex setups.
Want to dig deeper? Get in touch at [email protected] and we will review your case.
Frequently asked questions
What is SMTP and why does WordPress need a plugin to send email?
SMTP (Simple Mail Transfer Protocol) is the standard protocol to send mail between servers. By default WordPress uses PHP's mail() function, which most hostings block or filter as spam. An SMTP plugin connects WordPress to a professional service (Gmail, Mailgun, Acumbamail, SES, Brevo) that authenticates sender with SPF, DKIM and DMARC, improving deliverability.
What's the most recommended free SMTP plugin in 2026?
Depends on volume. For small sites (under 500 emails/day) FluentSMTP or aGo SMTP work well. For medium volume (over 5000/day) WP Mail SMTP with official presets for Brevo or Mailgun is the most maintained option. Avoid plugins requiring complex OAuth login if you don't manage Google Workspace.
Is it safe to store SMTP credentials in wp_options?
Not always. Some plugins store SMTP password in plain text in database. aGo SMTP and FluentSMTP encrypt with wp-config.php's SECURE_AUTH_KEY. Recommendation: use App Password (Gmail) or revocable API key (Brevo, Mailgun) instead of the actual mail account password.
What about SPF, DKIM and DMARC when using an SMTP plugin?
The SMTP plugin only sends email, does NOT configure DNS. You must manually add in domain DNS panel: SPF (authorizes SMTP server), DKIM (cryptographic signature) and DMARC (spoofing handling policy). Without these three records, Gmail and Outlook classify mail as spam despite using professional SMTP.