Descripción
Add Mail SMTP settings for WordPress
Looking to modify the SMTP on your WordPress site?
Our Custom SMTP solution offers you this possibility, allowing you to easily change your WordPress SMTP settings, ensuring your emails consistently land in the recipient’s inbox.
Custom SMTP solves your email deliverability problems by reconfiguring WordPress to use a proper SMTP provider when sending emails.
What’s more, our intuitive settings page and comprehensive documentation will guide you through the process, making the task of modifying your SMTP settings easier than ever.
Custom SMTP is a free tool, packed with all the essential features you need to send your WordPress emails with absolute confidence!
Built-in Email Logging
Never wonder if your emails were sent again. Custom SMTP automatically logs every email sent from your WordPress site – including WooCommerce order notifications, contact form submissions, and password resets. Preview email content directly in wp-admin, debug delivery issues with detailed error messages, and export logs for compliance.
Configuration Options
You can set the following options:
- From Name & Email – Specify the sender name and email address for all outgoing emails
- SMTP Host – Your email provider’s server (e.g., smtp.gmail.com)
- SMTP Port – Common ports: 587 (TLS), 465 (SSL), 25 (None)
- Encryption – Choose between None, SSL, or TLS
- Authentication – Enable/disable SMTP authentication for relay servers
- Username & Password – Your SMTP credentials (password stored encrypted)
- Provider Presets – One-click configuration for Gmail, Outlook, iCloud, SendGrid, AWS SES, and more
Key Features
SMTP Configuration
* Configure any SMTP server (Gmail, Outlook, SendGrid, Mailgun, AWS SES, etc.)
* Support for SSL/TLS encryption
* Optional SMTP authentication for relay servers
* Test connection without sending emails
* Send test emails to verify configuration
Email Logging & Debugging
* Zero configuration – Logging works out of the box
* Track all emails sent from WordPress, WooCommerce, Contact Form 7, and any plugin
* View delivery status (sent/failed) with detailed error messages
* Debug wp_mail errors easily – See exactly why emails fail
* Store email headers for advanced troubleshooting
* Search by recipient, subject, or status
* Filter by date range (Today, 7 days, 30 days)
* Export logs to CSV for reporting and compliance
Email Preview & Content
* Preview email body directly from wp-admin – No need to send test emails
* View HTML source code of any logged email
* Outlook-style sidebar for quick preview
* Download any email as HTML file for archiving
* Optional content storage (disabled by default for privacy)
Security
* SMTP password encrypted in database (AES-256-CBC)
* All admin actions protected with nonces
* Capability checks on all operations
Capturas
SMTP Settings – Configure your email server with host, port, encryption, and authentication options. 
Email Logging Settings – Enable logging, set retention period, and optionally store email content for preview. 
Email Logs – View all sent emails with status, search, and filters. Export to CSV. 
Email Preview – Click any email to preview its content in an Outlook-style sidebar panel.
Instalación
- Install Custom SMTP by WPForms either via the WordPress.org plugin repository or by uploading the files to your server.
- Navigate to the Settings > Custom SMTP in the WordPress admin.
- Edit the settings using your chosen SMTP option (SMTP.com, Brevo (formerly Sendinblue), Mailgun SMTP, SendGrid SMTP, Postmark, SparkPost, Gmail SMTP, or Other SMTP) and adhere to the instructions for configuration.
1, 2, 3: You’re done!
Preguntas frecuentes
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What SMTP settings should I use?
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Custom SMTP includes presets for popular providers (Gmail, Outlook, AWS SES, SendGrid, etc.). Just select your provider and settings are auto-filled.
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List of SMTP Servers
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Here’s a reference list of common SMTP servers:
Professional Email Services
* SendGrid: smtp.sendgrid.net – TLS – Port 587
* Mailgun: smtp.mailgun.org – TLS – Port 587
* Amazon SES: email-smtp.[region].amazonaws.com – TLS – Port 587
* Brevo (Sendinblue): smtp-relay.brevo.com – TLS – Port 587
* Postmark: smtp.postmarkapp.com – TLS – Port 587
* Mailjet: in-v3.mailjet.com – TLS – Port 587Consumer Email Providers
* Gmail: smtp.gmail.com – TLS – Port 587
* Outlook/Office365: smtp.office365.com – TLS – Port 587
* Yahoo Mail: smtp.mail.yahoo.com – TLS – Port 587
* iCloud: smtp.mail.me.com – TLS – Port 587
* Zoho: smtp.zoho.com – TLS – Port 587
* AOL: smtp.aol.com – TLS – Port 587
* GMX: smtp.gmx.com – SSL – Port 465ISP Email (Regional)
* Comcast: smtp.comcast.net – Port 587
* Verizon: outgoing.verizon.net – SSL – Port 465
* AT&T: smtp.mail.att.net – SSL – Port 465
* Orange: smtp.orange.net – Port 25
* T-Online: securesmtp.t-online.de – TLS – Port 587
* 1&1 IONOS: smtp.1and1.com – TLS – Port 587Note: Settings may vary. Contact your provider for exact configuration.
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Does it work with WooCommerce?
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Yes! Custom SMTP logs all emails sent from WordPress, including WooCommerce order confirmations, shipping notifications, and customer emails.
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Is it compatible with contact form plugins?
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Yes, it works with Contact Form 7, WPForms, Gravity Forms, and any plugin that uses WordPress wp_mail() function.
Reseñas
Colaboradores y desarrolladores
“Custom SMTP: Email Deliverability – FREE & Easy-to-use” es un software de código abierto. Las siguientes personas han colaborado con este plugin.
Colaboradores
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Registro de cambios
2.1.0
Release Date – February 4, 2026
New Features
* Provider Presets: One-click configuration for Gmail, Outlook, AWS SES, SendGrid, Mailgun, Brevo, Postmark, Mailjet, Zoho, and Yahoo.
* Auto-fill settings: Select a provider and Host, Port, Encryption, Authentication are automatically configured.
* Documentation links: Quick access to each provider’s SMTP documentation.
UI Improvements
* Redesigned settings page with card-based layout.
* Status bar showing SMTP configuration state at a glance.
* Collapsible Advanced Settings section.
* Save button in each settings card for quick access.
* Responsive design for mobile admin access.
2.0.0
Release Date – February 4, 2026
Major Release – Architecture Refactor & Email Logging
New Features
* Email Logging: Track all sent emails with recipient, subject, date/time, and status (success/failed).
* Email Logs Dashboard: View all logged emails with search, filters, and pagination.
* Email Preview Sidebar: View full email content in an Outlook-style sidebar panel.
* Email Content Storage: Optionally store complete email body for later preview (disabled by default for privacy).
* Download Email: Export any logged email as HTML file for archiving or debugging.
* Date Range Filters: Quick filters for Today, Last 7 days, Last 30 days.
* CSV Export: Export email logs to CSV for reporting and analysis.
* Auto-purge: Configurable log retention (default 30 days) with automatic cleanup.
* Statistics Bar: Compact inline stats showing total, sent, failed, and today’s email counts.
* Refresh Button: One-click refresh of email logs.
Architecture
* Complete OOP refactor with PSR-4 namespaces (CustomSMTP\).
* Dependency injection pattern for better testability.
* Separated concerns: Plugin, Settings, Mailer, Logger, Encryption classes.
* Custom database table for email logs.
Security
* Email preview uses sandboxed iframe (no JavaScript execution).
* Email body limited to 500KB to prevent database bloat.
* All AJAX actions protected with nonce verification and capability checks.
Improved
* Cleaner, more maintainable codebase.
* Better separation of admin UI and core functionality.
* Enhanced error handling throughout.
* Responsive design for mobile admin access.
Note
* All v1.x settings are preserved and compatible.
* Email logging is enabled by default (can be disabled in settings).
* Email content storage is disabled by default – enable in settings to use preview feature.
1.9.0
Release Date – December 5, 2025
Security
* SMTP password is now encrypted in the database using AES-256-CBC with WordPress salts.
* Password field no longer displays the stored value (shows placeholder instead).
Added
* New “Test Connection” button to verify SMTP settings without sending an email.
* New “SMTP Authentication” option (Yes/No) to support relay servers without authentication.
* Improved error messages: common PHPMailer errors are now translated to user-friendly messages.
Changed
* Test buttons now show “Test Connection” and “Send Test Email” separately.
* Password field shows “Leave empty to keep current password” when a password is already saved.
Note
* Existing plaintext passwords will continue to work and will be encrypted on next save.
1.8.1
Release Date – December 5, 2025
Fixed
* WordPress 6.9 compatibility: Use wp_mail_from filter instead of setting From in phpmailer_init (fixes “Invalid address” error).
* Fixed test email button not working due to duplicate PHPMailer hooks.
Changed
* Breaking: “Mail From” field moved from Optional to Main settings (now required for WordPress 6.9+).
* Test button now auto-saves settings before sending test email.
* Improved error messages: shows which required fields are missing.
* Disabled SMTPAutoTLS when security is set to “None” (fixes Mailpit/local testing).
1.8.0
Release Date – December 4, 2025
Fixed
* WordPress 6.9 compatibility: Fixed email sending failure with AWS SES and other SMTP providers that require verified sender addresses.
* Added proper Envelope-From (Sender/Return-Path) configuration to comply with WordPress 6.9 PHPMailer changes.
* Test emails now correctly use the configured “Mail From” address as the envelope sender.
Changed
* Minimum WordPress version updated to 6.0.
* Minimum PHP version updated to 7.4.
Note
* Users must configure the “Mail From” field in optional settings with a verified email address (especially important for AWS SES users).
1.7
Release Date – July 5, 2024
Improved
* Improved security of saved options with appropriate validation and sanitization.
* Code optimization by removing unused code comments and adding value checks before use.
* Split the main custom-smtp.php file into several files to improve maintainability and readability.
* Creation of includes/admin, includes/smtp and includes/utils folders to organize code by functionality.
Fixed
* Fixed validation of secure options to ensure they are either none, ssl or tls.
* Translations : Test email.
1.6
Release Date – April 3, 2024
- New optional settings for all emails sent by WordPress:
- Addition of “Reply To” option: This feature allows you to specify an email address that recipients will send replies to, instead of the original sender’s email address. This is useful when the sender does not wish to receive replies directly.
- Addition of “CC” option: “CC” stands for “Carbon Copy”. When you CC an email to someone, you send them a copy of your email. The CC’d person may not be the main recipient of the email, but they are included for their reference. Everyone who receives the email can see who has been CC’d.
- Addition of “BCC” option: “BCC” stands for “Blind Carbon Copy”. This works like CC, but BCC recipients are hidden from the other recipients. This is useful when you want to inform someone without letting others know that they are also receiving the same email.
- Incompatible plugin detection: This feature helps identify any plugins that are not compatible and could potentially cause issues (proactive approach to prevent conflicts). It will alert you if an installed plugin is not compatible with the Custom SMTP plugin, allowing you to take necessary action.
- Comprehensive test email with configuration information
1.5
Release Date – March 14, 2024
- You can test your SMTP settings before saving them.
- Secure SMTP option accept
Noneas value. - Custom CSS for Settings.
1.4
Release Date – March 12, 2024
- Public launch of the plugin!
- Completely translated into English and French.
- All SMTP options are editable.