ByteCoreStack - SMTP & Health Monitor

Is your WordPress site quietly failing to send email? Order confirmations, password resets and contact form messages that never arrive usually go unnoticed until a customer complains. ByteCoreStack - SMTP & Health Monitor sends your WordPress email through a real, authenticated SMTP server, keeps a searchable log of every email with its full message, and tells your team on Slack, Microsoft Teams, Google Chat or Discord the moment sending breaks. Why WordPress emails fail Out of the box, WordPress sends email with PHP mail(). It has no authentication, so Gmail, Outlook and Yahoo often send those messages to spam or reject them, and many hosts disable it entirely. That's why "WordPress not sending email" is one of the most common WordPress problems. The fix is SMTP: sending through a real mail server that signs in, such as Gmail, Microsoft 365, your host's mail server or a transactional email service. Set up in about a minute

1. Pick your provider. The server, port and encryption fill in for you, with sign-in tips for that provider.
2. Enter your username and password (or app password / API key) and click Save and test connection. The plugin signs in to your server right away and tells you whether it worked.
3. Send a test email to confirm a real message arrives.

Features Reliable sending

• Send all WordPress email through any SMTP server: SSL, TLS or no encryption, with automatic TLS upgrade
• Ready-made settings for Gmail / Google Workspace, Microsoft 365 / Outlook, SendGrid, Amazon SES, Mailgun, Brevo, Zoho Mail and Yahoo Mail, plus any other SMTP server
• Test email with a plain explanation when it fails: sign-in failed, rejected by the server, or couldn't connect, along with the server's own reply
• SMTP password encrypted at rest

Email log

• Every email WordPress sends, grouped by day, with its delivery status and the server's reason for any failure
• Open any email on its own page: a safe preview of the message, its HTML source, a text version, every header and attachment names, with a phone-width preview to check mobile layout
• Search, filter by status (with counts) and date range, and export to CSV
• Keeps the last 90 days and removes older entries automatically

Health checks and failure alerts

• Automatic health check every 15 minutes once SMTP is set up: a real sign-in and sender check, with no email sent
• Alerts to Slack, Microsoft Teams, Google Chat, Discord and a custom webhook (for Zapier, Make or n8n), as many at once as you like
• An alert on the first failed check, and one alert per outage, so a long outage never floods your channel
• Checks whether Microsoft 365 reports an outage before alerting, when you send through Microsoft 365

Reports

• Delivery chart and totals for the last 7, 30 or 90 days, with highlights such as your busiest day, failure-free days and how many people your email reached
• Monthly summary email on the 1st of every month at 9:00, covering the previous month, sent to whoever you choose

Built for WordPress

• Overview screen showing whether mail is flowing, when the last and next checks run, and what's left to set up
• Dashboard widget with SMTP health and 30-day totals
• WP-CLI commands: wp bcs-smtp test and wp bcs-smtp log list
• Dark, responsive admin that works on phones and tablets, with keyboard-accessible controls and bundled fonts (no external requests)

Works with any plugin that sends email WooCommerce, Contact Form 7, WPForms, Gravity Forms, Elementor Forms, Easy Digital Downloads, membership and booking plugins, and WordPress's own password reset and new user emails all send through wp_mail(), so they use your SMTP connection automatically. There's nothing to change in those plugins. Supported SMTP providers Any provider that offers standard SMTP sign-in works:

• Gmail / Google Workspace (app password, or the Workspace SMTP relay for higher volume)
• Microsoft 365 / Outlook
• SendGrid
• Amazon SES
• Mailgun
• Brevo
• Zoho Mail
• Yahoo Mail, SMTP.com, or your web host's mail server

Privacy Everything the plugin stores stays in your own WordPress database: your SMTP settings, and the email log (each email's date, subject, sender, recipients, delivery status, message body, headers and attachment file names). Attached files themselves are never copied. Log entries are deleted automatically after 90 days, only administrators can see them, and uninstalling the plugin removes all of its data. Nothing is sent to ByteCore Stack. See External services below for the services the plugin contacts. Documentation and support Plugin home page: bytecorestack.com/plugins/smtp-manager. For questions or bug reports, use the support forum on this plugin's WordPress.org page. Credits The admin screens use two fonts bundled with the plugin, both under the SIL Open Font License 1.1 (license files included in assets/fonts): Outfit and Geist Mono.

1.3.0 Redesigned admin. A new Overview shows whether mail is flowing, which server and sender address are in use, when the last and next health checks run, where alerts go, a 7, 30 or 90-day activity chart, quick actions and what's left to set up. Tabs are now Overview, Connection, Alerts, Reports and Email log, and every screen works on phones and tablets. One-minute setup. Pick your provider (Gmail / Google Workspace, Microsoft 365, SendGrid, Amazon SES, Mailgun, Brevo, Zoho, Yahoo or any other SMTP server) and the server, port and encryption fill in, with sign-in tips for that provider. The password field is labelled for that provider (for example "App password" for Gmail). Testing sits right next to the connection form, and you're warned before leaving with unsaved changes. View the full email. Every email is now saved with its body, headers and attachment names for 90 days. Click View on any row of the Email log to open it on its own page: a safe preview, the HTML source, a text version, a phone-width preview, every header and the mail server's reply. Emails saved by 1.2.1's "store failed emails" option are kept and can be viewed too. Email log. Grouped by day (Today, Yesterday, then by date), with status filters that show counts, search, date ranges, 10 to 100 rows per page and CSV export. Rows stay short and easy to scan; the server's full reason for a failure is on the email's own page. The log keeps the last 90 days. If you're updating from a version that kept everything, older entries stay for 30 days after the update, and the Email log offers an export of all entries before they go. Clearer alerts. Every alert now opens with a plain title ("Email is failing on your site"), and says what's wrong in plain words. Slack, Teams and Discord get properly formatted cards, and test alerts say clearly that they're a test. Alerts to several channels at once. Pick any mix of Slack, Microsoft Teams, Google Chat, Discord and a custom webhook. Each one gets the alert, and "Send test alert" reports how each did. Webhook URLs are checked as you type. Always-on health checks. Checks run every 15 minutes once SMTP is set up, alert on the first failure and send one alert per outage. The interval, threshold and alert-limit settings are gone. The health check now also checks your sender address, so a server that accepts the connection but rejects your email is reported as failing. Monthly report. The report email now goes out on the 1st of every month at 9:00 (site time) and covers the whole previous month, instead of 24 hours after saving and drifting from there. Your daily or weekly report is switched to monthly when you update. "Send a report now" sends the current month so far. Recipients are entered as tags, the next send date is shown, and turning "Email me this report" off hides the report options. Redesigned emails. The test email and the monthly report have a cleaner layout that fits phones and supports dark mode. The report leads with a clear verdict and the delivery rate, then shows sent, failed and unconfirmed totals and a day-by-day chart for every day of the month, with a button to open the full report. The test email confirms which server and sender it went through and when. Reports. Delivery chart for 7, 30 or 90 days with totals and highlights: average per day, busiest day, failure-free days, longest failure-free run and how many people your email reached (not counting your own team). Charts are drawn by the plugin, so the bundled Chart.js library (about 200 KB) is no longer loaded. Fixes (including fixes prepared for 1.2.2, which wasn't released separately):

• Fixed "Could not authenticate" errors when a security plugin rotates the WordPress salts (All-In-One Security, Solid Security, Sucuri) or the site moves: the SMTP password now uses its own encryption key, or a BCS_SMTP_CRYPTO_KEY constant in wp-config.php. Existing passwords are moved over automatically.
• Fixed the health check reporting "healthy" when the password was empty, unreadable or not accepted.
• Fixed a "translation loading was triggered too early" notice on WordPress 6.7 and later.
• Errors now include the mail server's actual reply, such as Microsoft 365's 535 5.7.139 codes, and a blocked SMTP port times out after 20 seconds instead of hanging.
• Microsoft Teams alerts are sent as Adaptive Cards and accept Teams Workflows (Power Automate) webhook URLs.
• The "last check" and "next check" times always add up to the 15-minute interval.
• Amazon SES no longer pre-fills a region: paste the SMTP endpoint for your own region.
• CSV export now protects against spreadsheet formula injection: a subject or address starting with =, +, - or @ (which can come from a contact form) is exported as plain text.
• Uninstalling on a multisite network now removes the plugin's data from every site, not just the main one.
• A password saved by 1.0.0, which was stored as plain text, is encrypted when you update. Removed. The Settings tab, the opt-in "resend failed emails" feature and wp bcs-smtp resend.

Under the hood. Bundled Outfit and Geist Mono fonts (no external requests), the outgoing IP lookup is cached for a day, the email log loads only the columns it shows, uninstalling also removes the plugin's temporary data, and the readme now documents every external service. 1.2.1 This is the first version published to WordPress.org since 1.1.0. Everything below was built after 1.1.0 and is being released here for the first time — none of it shipped as a separate public update. Renamed from "SMTP Manager – Email Logs, Monitoring & Alerts" to "ByteCoreStack - SMTP & Health Monitor" for a clearer, more distinctive plugin name. Display name only — the plugin slug (bcs-smtp-manager) and all your settings are unchanged. Resend failed emails — a new opt-in "Store failed email content" setting (Config tab, off by default) retains the body of an email only when it fails to send, so a "Resend" button now appears on failed rows in the Email Log. Resending creates a fresh log entry with its own delivery status; stored content auto-purges after a configurable number of days (default 7), independently of your overall log retention setting. WP-CLI support — wp bcs-smtp test <email>, wp bcs-smtp resend <log_id>, and wp bcs-smtp log list for scripted test sends, resends, and log lookups from the command line or a CI/deploy pipeline. Directory compliance — rewrote parts of the description and admin UI to remove comparative claims about other SMTP plugins, and documented the plugin's use of external services (SMTP server, alert webhooks, ipify.org, Microsoft 365 status API) in the External Services section, per WordPress.org directory guidelines. Self-hosted admin fonts — the admin UI no longer loads DM Sans/DM Mono from the Google Fonts CDN; it uses the system font stack instead. Fixes a Plugin Check "offloaded content" error and removes an external request made on every visit to the settings page. Readme fix — Tested up to now uses major.minor format (7.0) instead of including a patch version, per the WordPress.org readme spec. Older versions are listed in changelog.txt, included with the plugin.