Flex SMTP
Flex SMTP is the mail layer for the FLEX plugin suite. Flex Forms (and anything else that calls wp_mail() ) can leave SMTP credentials out of form settings. This plugin owns delivery: provider presets, SMTP or HTTP API, a test send, and a searchable log. It is built for sites that already use FLEX p
Flex SMTP is the mail layer for the FLEX plugin suite. Flex Forms (and anything else that calls wp_mail() ) can leave SMTP credentials out of form settings. This plugin owns delivery: provider presets, SMTP or HTTP API, a test send, and a searchable log.
It is built for sites that already use FLEX plugins, and for hosts that block outbound SMTP ports 465/587. HTTP API sending uses WordPress wp_remote_post only — no vendor SDKs are bundled.
- Provider presets (Gmail, Microsoft 365, SendGrid, Mailgun, Amazon SES, and more)
- SMTP for every provider, or HTTP API for transactional services
- From email / name, default From replacement, and optional Force From
- One-click test email
- Searchable delivery log with retention
- Copies old Flex Forms SMTP options on first activate
Enable is off by default. Mail stays on the WordPress default mailer until you save a provider and turn Enable on.
CSS and JavaScript are loaded from this plugin only. There is no telemetry and no remote update checker.
Privacy
SMTP usernames, passwords, and API keys are stored in your WordPress database (leave a secret field blank when saving to keep the stored value). The optional email log stores recipient, subject, success/fail, and error text. Only administrators can view the log or settings.
When Enable is on, message content is sent to the SMTP host or HTTP API you configured. Flex SMTP does not send mail to any other remote service. See External services .
External services
This plugin connects to a third-party mail service only after an administrator chooses that provider, saves credentials, and turns Enable on (or clicks Send test). Until then, WordPress uses the default mailer. The plugin does not phone home.
What data is sent (every provider): From, To, Cc, Bcc, Reply-To, subject, body, and attachments from wp_mail() . SMTP also sends the saved username and password. HTTP API also sends the saved API key, and the secret, domain, or region when that provider requires them.
When data is sent: On each wp_mail() call while Enable is on, and when an administrator sends a test email.
Why: To deliver WordPress mail (password resets, form notifications, WooCommerce, and so on) through the account you already have with that provider.
