WT SMTP
Lightweight SMTP for WordPress that tells you why mail goes to spam — live SPF, DKIM, DMARC and MX validation, mail log, test email and one-click import from WP Mail SMTP. Free and open-source.
What it does
WT SMTP sends all WordPress e-mail through an SMTP server of your choice. Most SMTP plugins only tell you whether a send returned true or false; WT SMTP shows why mail goes to spam before you press Send: the settings page checks the DNS records of your From domain and lists missing, broken and weak records together with what to fix. No external tools, no telemetry, no PRO version.
Key features
- Any SMTP provider — presets for a hosting mailbox (cPanel, DirectAdmin, Plesk), Gmail, Microsoft 365, SendGrid, Brevo, Mailgun, Amazon SES
- Import from WP Mail SMTP — one click, including the encrypted password
- AES-256 password encryption with a key in
wp-config.php - Test email with the exact PHPMailer error on failure
- Conflict detection — warns about other active SMTP plugins
- DNS health check — SPF (incl. the 10-lookup limit), DKIM, DMARC and MX validated, not just “record exists”
- Mail log — metadata only, one-click resend of failed messages, configurable retention
- GDPR-friendly recipient anonymization in the log
- Copy diagnostic info — a ready text block for support tickets
- Zero dependencies — no Composer, no JS framework, no call-home
Installation
Search for “WT SMTP” in Plugins → Add New in your WordPress admin, or upload the ZIP manually. Activate, open Webmasters.Team → WT SMTP, pick a provider preset, enter your credentials and send a test email.
Support
Report bugs and ask questions on the official WordPress.org support forum or by e-mail: wpsupport@webmasters.team.