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Flex SMTP<\/strong> is the mail layer for the FLEX plugin suite. Flex Forms (and anything else that calls 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 Enable is off by default. Mail stays on the WordPress default mailer until you save a provider and turn Enable on.<\/p>\n\n CSS and JavaScript are loaded from this plugin only. There is no telemetry and no remote update checker.<\/p>\n\n 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.<\/p>\n\n 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<\/strong>.<\/p>\n\n This plugin connects to a third-party mail service only after an administrator chooses that provider, saves credentials, and turns Enable<\/strong> on (or clicks Send test). Until then, WordPress uses the default mailer. The plugin does not phone home.<\/p>\n\n What data is sent (every provider):<\/strong> From, To, Cc, Bcc, Reply-To, subject, body, and attachments from When data is sent:<\/strong> On each Why:<\/strong> To deliver WordPress mail (password resets, form notifications, WooCommerce, and so on) through the account you already have with that provider.<\/p>\n\n Amazon Simple Email Service delivers mail when Amazon SES<\/strong> is selected. SMTP connects to Service: Amazon SES<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Google SMTP ( Service: Gmail<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Microsoft SMTP ( Service: Microsoft 365<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Yahoo SMTP ( Service: Yahoo Mail<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Zoho SMTP ( Service: Zoho Mail<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through iCloud SMTP ( Service: iCloud<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through SendGrid SMTP ( Service: SendGrid<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Mailgun SMTP ( Service: Mailgun<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Postmark SMTP ( Service: Postmark<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Brevo SMTP ( Service: Brevo<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Mailjet SMTP ( Service: Mailjet<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through SparkPost SMTP ( Service: SparkPost<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through SMTP2GO SMTP ( Service: SMTP2GO<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail through Resend SMTP ( Service: Resend<\/a>\nTerms of Service<\/a>\nPrivacy Policy<\/a><\/p>\n\n Sends mail to the SMTP host you type in settings. That host\u2019s own terms and privacy policy apply. Flex SMTP does not choose or document a third party for Custom.<\/p>\n\n\n Yes. Flex Forms now calls No. Those providers use SMTP with an app password (and SMTP AUTH enabled on Microsoft 365). OAuth is not included.<\/p><\/dd>\n SMTP talks to the provider\u2019s mail server through PHPMailer. HTTP API posts the message with Not while Enable is on. Messages go to your SMTP host or the provider API. Turn Enable off to return to the default WordPress mailer.<\/p><\/dd>\n Recipient, subject, success or fail, error text, and time. It does not store API keys or passwords. Disable Email log if you do not want delivery history.<\/p><\/dd>\n Deleting the plugin removes settings, credentials, and the log table. Deactivating alone keeps your data.<\/p><\/dd>\n\n<\/dl>\n\n\nwp_mail()<\/code>) 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.<\/p>\n\nwp_remote_post<\/code> only \u2014 no vendor SDKs are bundled.<\/p>\n\n\n
Privacy<\/h4>\n\n
External services<\/h3>\n\n
wp_mail()<\/code>. 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.<\/p>\n\nwp_mail()<\/code> call while Enable is on, and when an administrator sends a test email.<\/p>\n\nAmazon SES<\/h4>\n\n
email-smtp.{region}.amazonaws.com<\/code> (for example email-smtp.us-east-1.amazonaws.com<\/code>). HTTP API posts SendRawEmail to email.{region}.amazonaws.com<\/code>. The region is the one you pick in settings.<\/p>\n\nGmail \/ Google Workspace<\/h4>\n\n
smtp.gmail.com<\/code>) when that provider is selected. Uses an app password (OAuth is not included).<\/p>\n\nMicrosoft 365 \/ Outlook<\/h4>\n\n
smtp.office365.com<\/code>) when that provider is selected. Uses SMTP AUTH and, when required, an app password.<\/p>\n\nYahoo Mail<\/h4>\n\n
smtp.mail.yahoo.com<\/code>) when that provider is selected. Uses an app password.<\/p>\n\nZoho Mail<\/h4>\n\n
smtp.zoho.com<\/code>) when that provider is selected.<\/p>\n\niCloud Mail<\/h4>\n\n
smtp.mail.me.com<\/code>) when that provider is selected. Uses an app-specific password.<\/p>\n\nSendGrid<\/h4>\n\n
smtp.sendgrid.net<\/code>) or the SendGrid HTTP API when that provider is selected.<\/p>\n\nMailgun<\/h4>\n\n
smtp.mailgun.org<\/code> or smtp.eu.mailgun.org<\/code>) or the Mailgun HTTP API (api.mailgun.net<\/code> or api.eu.mailgun.net<\/code>) when that provider is selected. HTTP API also sends the Mailgun sending domain you enter.<\/p>\n\nPostmark<\/h4>\n\n
smtp.postmarkapp.com<\/code>) or the Postmark HTTP API when that provider is selected. The API key is the Postmark server token.<\/p>\n\nBrevo<\/h4>\n\n
smtp-relay.brevo.com<\/code>) or the Brevo HTTP API when that provider is selected.<\/p>\n\nMailjet<\/h4>\n\n
in-v3.mailjet.com<\/code>) or the Mailjet HTTP API when that provider is selected. HTTP API also sends the Mailjet API secret.<\/p>\n\nSparkPost<\/h4>\n\n
smtp.sparkpostmail.com<\/code> or smtp.eu.sparkpostmail.com<\/code>) or the SparkPost HTTP API when that provider is selected. SparkPost is a Bird service.<\/p>\n\nSMTP2GO<\/h4>\n\n
mail.smtp2go.com<\/code>) or the SMTP2GO HTTP API when that provider is selected.<\/p>\n\nResend<\/h4>\n\n
smtp.resend.com<\/code>) or the Resend HTTP API when that provider is selected.<\/p>\n\nCustom SMTP<\/h4>\n\n
\n
flex-smtp<\/code> folder to \/wp-content\/plugins\/<\/code>, or install the zip via Plugins \u2192 Add New \u2192 Upload Plugin<\/strong>.<\/li>\n\n
Does this replace the SMTP settings that used to live in Flex Forms?<\/h3><\/dt>\n
wp_mail()<\/code> only. Activate Flex SMTP once to copy the old Forms SMTP options, then manage delivery here.<\/p><\/dd>\nDoes Gmail or Microsoft 365 use OAuth?<\/h3><\/dt>\n
What is the difference between SMTP and HTTP API?<\/h3><\/dt>\n
wp_remote_post<\/code> and skips PHPMailer. Use HTTP API if outbound ports 465\/587 are blocked. Gmail, Microsoft 365, Yahoo, Zoho, iCloud, and Custom are SMTP only.<\/p><\/dd>\nWill mail still go through my web host?<\/h3><\/dt>\n
What is stored in the email log?<\/h3><\/dt>\n
What happens when I uninstall?<\/h3><\/dt>\n
1.0.1<\/h4>\n\n
\n
1.0.0<\/h4>\n\n
\n