Start with MailPoet > Help > System Status. If Task Scheduler Connection is unsuccessful, MailPoet cannot process its queue, so newsletters, post notifications and other messages will remain unsent. Open the cron URL shown on that page; the correct response is pong. Then verify the sending method, domain authentication, sender address, queue and logs in that order.
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1. Check MailPoet System Status first
MailPoet sends campaigns and scheduled emails through background tasks. A broken scheduler can make an email appear configured correctly while nothing moves beyond 0%. The System Status screen shows the components that must work together.
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- Review Task Scheduler Connection, Cron Status, Action Scheduler Status, Sending Queue and database-consistency checks.
- If Task Scheduler Connection says “Connection unsuccessful,” copy or open the displayed cron URL in a browser.
- Confirm that the response is exactly
pong(with no login page, homepage HTML or error message).
“Connection unsuccessful” is not a minor warning: sending will not work until the endpoint can be reached. A homepage response, a WordPress login screen or an HTTP error usually means a firewall, security rule, authentication layer, proxy or loopback restriction is intercepting MailPoet’s background request.
2. Repair the scheduler and cron mode
Use WordPress built-in cron as the baseline
- Open MailPoet > Settings > Advanced.
- Find Newsletter Task Scheduler.
- Select WordPress built-in cron (recommended) and save the setting.
- Return to System Status and watch the scheduler connection and queue after the next scheduled run.
In the site’s scheduled actions, look for mailpoet/cron/daemon-trigger. It should have a future run time and complete without an error. A missing, repeatedly failing or permanently overdue action indicates that WordPress cron is not executing, even if the MailPoet setting itself is correct.
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When server cron is involved
Some sites replace WordPress’s traffic-driven cron with a server-side cron job. That can be reliable when correctly configured, but a disabled job, incorrect PHP binary, blocked loopback request or hosting policy can leave MailPoet idle. If server-side cron is unreliable, either repair that job or switch back to the default Action Scheduler/WordPress cron option and retest. Do not leave two competing schedulers running the same MailPoet tasks while troubleshooting.
Common scheduler transport failures
- cURL error 28: the request timed out. Ask the host to review cURL timeout limits and slow PHP execution.
- cURL forbidden: a web-application firewall, security plugin or host rule rejected the request. Have the blocking URL or route allow-listed.
- SSL connect error 35: the server could not complete the TLS connection. The host may need to update cURL, OpenSSL or PHP certificates.
- Blocked loopback requests: WordPress cannot call its own site. Ask the host to permit loopback requests and check whether maintenance mode, basic authentication or IP restrictions are active.
- Proxy or firewall failures: outbound requests to MailPoet’s bridge or service are being filtered. The host must permit the required destination and ports.
After each change, rerun the System Status check and open the cron URL again. A successful pong response is the objective; changing templates or sender addresses cannot compensate for a scheduler that never runs.
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MailPoet can route WordPress mail through several paths. The correct diagnostic log depends on the path selected in the site settings.
- Go to MailPoet > Settings > Advanced.
- Inspect Send all site’s emails with….
- Record whether the site uses MailPoet Sending Service, the host, SMTP, Amazon SES or SendGrid.
- Send one targeted test message after recording the setting, then inspect the matching log.
| Sending method | How the message leaves WordPress | Domain authentication | Retry behavior for failed transactional mail | Where to investigate |
|---|---|---|---|---|
| Host / default WordPress method | WordPress wp_mail |
Depends on the host and receiving providers; a domain-based sender is still preferable | Not established by MailPoet’s direct service; host behavior applies | A wp_mail logger such as WP Mail Logging, plus host mail logs |
| MailPoet Sending Service | Direct MailPoet service connection | Authenticate the sending domain for Sending Service plans | MailPoet can fall back to the host for transactional email when the service is unavailable | MailPoet > Settings > Advanced > Logging and Sending Service/account status |
| SMTP | Direct connection to the configured SMTP provider | Follow that provider’s domain and DNS requirements | Third-party transactional messages may be lost if the provider is unavailable rather than queued for later retry | MailPoet logging and the SMTP provider’s logs |
| Amazon SES | Direct provider connection | Follow SES identity and domain-verification requirements | Third-party transactional messages may not be queued for a later retry when the provider is unavailable | MailPoet logging and SES event or sending logs |
| SendGrid | Direct provider connection | Follow SendGrid sender and domain-authentication requirements | Third-party transactional messages may not be queued for a later retry when the provider is unavailable | MailPoet logging and provider activity logs |
WP Mail Logging records traffic that goes through WordPress wp_mail. It does not see messages sent directly through MailPoet Sending Service, SMTP, Amazon SES or SendGrid. For those paths, use MailPoet’s own Advanced > Logging screen and a controlled test transactional email.
4. Validate the MailPoet Sending Service connection
Revalidate the account and key
- Check that the MailPoet key or connection is still valid.
- Confirm that the connected plan is active and has not expired, been cancelled or exceeded its allowance.
- Reconnect or reauthorize the service if System Status reports an account or connection error.
Authenticate the sending domain
MailPoet requires authenticated domains for Sending Service plans in response to requirements from major mailbox providers, including policy changes discussed for 2024. Complete the DNS records MailPoet provides for the domain used in the From address, wait for DNS propagation, and rerun the verification. Authentication improves provider trust; it does not repair a scheduler or a blocked server request, so resolve those failures separately.
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Choose a valid sender
Use a From address on the site’s own domain. Avoid using a free mailbox domain such as Gmail, Yahoo or Hotmail as the From identity for regular site mail. Keep the From and Reply-To addresses aligned with the organization readers recognize, and avoid role addresses when the receiving provider or policy treats them as suspicious.
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A queue stuck at 0%, a paused queue or repeated retries identifies a different failure from a message that leaves MailPoet but never reaches an inbox.
- Open MailPoet > Settings > Advanced > Logging.
- Temporarily choose Errors only for a focused check, or Everything when the failure is intermittent and you need the complete sequence.
- Trigger one test email rather than sending an entire campaign.
- Read the full error, including the last-seen error, retry count and provider response.
- Return logging to the least verbose useful level after diagnosis, especially on a busy site.
MailPoet does not log transactional emails by default. If a password reset or store notification is missing from the log, enable the appropriate MailPoet logging level and repeat a single test. For a site using the host/WordPress method, inspect the wp_mail logger instead; an empty MailPoet log is then expected.
6. Fix newsletters and Post Notifications that are paused or stuck
Interpret the status in history
- Go to MailPoet > Emails > Post Notifications > View history.
- Open the affected email and note its exact status.
- Stuck at 0 / X: commonly points to a Sending Service or scheduler problem. Resolve System Status and account errors before editing the message.
- Paused: sending was paused manually or MailPoet paused it after detecting a problem. Resume only after reading the associated error and confirming the transport is healthy.
- Rendering problem: the template may contain corrupted or unsupported content. Recreate the email from a clean template if the error persists.
Check the email’s configuration
- Make sure the Post Notification is active.
- Confirm that its trigger conditions match the post type, category, timing and publication event you are testing.
- Include the Automatic Latest Content block when the notification requires it.
- Target the list that actually contains the intended subscribers.
- Verify that recipients are subscribed and not merely present as imported or inactive contacts.
If subscribers are not added to the selected list, they will not receive the notification. A correctly rendered email with an empty or wrong audience can therefore look like a delivery failure when the queue is functioning normally.
7. Troubleshoot password resets and WooCommerce-style transactional mail
Password-reset links, account notices and order messages are generally generated as transactional WordPress mail. First establish whether the site routes them through wp_mail or a direct MailPoet/provider connection; the setting is the same Send all site’s emails with… control described above.
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If the site uses the WordPress/host path
- Trigger one password reset or test order.
- Confirm the message appears in the
wp_maillogger. - If it is logged but not received, investigate the host’s outbound mail, sender authentication and recipient-side filtering.
- If it is not logged, inspect the WordPress or plugin error that prevented the call to
wp_mail.
If the site uses MailPoet or a direct provider
- Enable MailPoet logging and repeat one transaction.
- Check the queue, provider response and retry count.
- Confirm the From domain is authenticated and the account or API key is active.
- Remember that a third-party provider outage may lose a transactional message instead of placing it in a later retry queue. MailPoet Sending Service can fall back to the host for transactional email, which is a different behavior from many direct third-party connections.
Do not diagnose a missing password-reset message by sending a newsletter test alone. A newsletter can use a different queue, template and recipient path from a transactional message.
8. Separate delivery problems from inbox placement
When MailPoet reports a successful send but the recipient sees nothing, the failure may be after MailPoet. Check the receiving mailbox’s spam, promotions and quarantine areas, then inspect the provider’s delivery or bounce record when available.
- Use a domain-specific From address rather than a free-mail address.
- Keep From and Reply-To aligned and recognizable.
- Complete the required domain authentication for the selected sending service.
- Review message content and remove links or domains that a provider has blacklisted or classified as suspicious.
- Test with more than one recipient domain to distinguish a site-wide failure from one mailbox provider’s filtering.
Do not change the scheduler when the queue has completed and the provider has accepted the message. At that point, focus on authentication, reputation, content and recipient-side filtering.
9. A complete recovery sequence
Use this order so that each test changes only one major variable.
- Open MailPoet > Help > System Status and record every failed component.
- Open the displayed cron URL and require the exact response
pong. - Set Newsletter Task Scheduler to WordPress built-in cron (recommended) unless a known-good server cron is being maintained.
- Verify
mailpoet/cron/daemon-triggerhas a future run and no execution error. - Resolve cURL, SSL, proxy, firewall, security-plugin and loopback blocks with the host or site administrator.
- Record the active option under Send all site’s emails with….
- Revalidate the MailPoet key, plan or provider credentials.
- Authenticate the From domain and use a domain-based sender.
- Set logging to Errors only or Everything, then send one targeted transactional test.
- Inspect the queue, retry count, last-seen error and the correct logger for the selected transport.
- For Post Notifications, check active status, trigger conditions, Automatic Latest Content, list membership and template integrity.
- Only after the test succeeds, resume the paused campaign or schedule the production email.
10. When your host must intervene
Contact hosting support when you cannot change outbound firewall rules, loopback access, PHP/cURL libraries, TLS certificates, proxy settings or server cron. Give support the exact System Status error, HTTP response, timestamp, affected URL and whether the cron test returned pong. Ask them specifically to permit the MailPoet background request, allow loopback traffic, raise cURL timeouts where error 28 appears, correct SSL support for error 35, and verify that the scheduled PHP process runs under the same site user and PHP version as WordPress.
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Managed WordPress hosting can remove some server-maintenance work, but it cannot replace domain authentication or correct an inactive MailPoet account. After the host confirms the endpoint is reachable, repeat the System Status and one-message tests yourself.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.11. Use the symptom to choose the next test
The visible symptom usually tells you which layer to test first:
- Everything is stuck at 0%: start with Task Scheduler Connection, the cron URL and
mailpoet/cron/daemon-trigger. Do not rebuild the email until the endpoint returnspong. - The queue is paused: open the queue or history entry, read the last-seen error, and determine whether MailPoet paused it automatically or an administrator paused it manually.
- A campaign completes but nobody receives it: inspect the selected provider’s activity, authenticated domain, sender identity, bounces and recipient spam or quarantine folders.
- Only password resets or order notices fail: send one controlled transactional test and use the logger that matches the active transport. A newsletter result does not prove that transactional mail works.
- Only one Post Notification fails: verify its active status, trigger rules, target list, subscribed recipients, required Automatic Latest Content block and template rendering.
- MailPoet shows no transactional entry: that is normal until transactional logging is enabled, or it may indicate that the site is using the host’s
wp_mailpath instead of MailPoet’s direct path.
Change one variable at a time and keep the original error text. Repeatedly switching providers, schedulers and templates at once can hide the condition that actually fixed the site.
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- Keep one known-good scheduler configuration. If server cron is used, document its command, PHP version and run interval; otherwise use WordPress built-in cron as the baseline recommended in MailPoet.
- After changing hosts, firewalls, security plugins, PHP, cURL or TLS settings, rerun System Status and confirm the cron endpoint still returns
pong. - Keep the Sending Service key, plan status and authenticated DNS records documented so an expired connection is caught quickly.
- Use a domain-based From address consistently and keep Reply-To recognizable. Changing to a free-mail sender can create a deliverability problem even when the queue is healthy.
- Use a short, targeted test for diagnostics and return logging from Everything to Errors only after the incident to limit unnecessary log growth.
- Do not install multiple competing cron or mail-routing solutions without understanding which one owns the queue. Duplicate schedulers can make diagnosis harder, while an inactive scheduler leaves every campaign waiting.
- For third-party SMTP, Amazon SES or SendGrid connections, document the provider’s outage and retry behavior. MailPoet notes that transactional messages may not be queued for later retry when those providers are unavailable; the Sending Service’s host fallback behaves differently.
13. What to include when opening a support ticket
A precise ticket gets a faster answer than “MailPoet is not sending.” Include the affected email type (newsletter, Post Notification, password reset or order message), the exact history status, the System Status results, the cron URL response, the active sending method, the full last-seen error, retry count, timestamp and recipient domain. State whether the message appears in MailPoet logging or a wp_mail logger, and whether a test reaches any mailbox. For hosting support, add the cURL, SSL, proxy, firewall or loopback error and ask them to confirm the relevant route, PHP process and outbound destination are permitted. Remove passwords, API keys and private subscriber data before sharing screenshots or logs.
What a fixed installation should look like
- System Status reports a successful Task Scheduler Connection.
- The cron endpoint returns
pong. mailpoet/cron/daemon-triggerruns on schedule without errors.- The Sending Queue advances instead of remaining at 0% or paused.
- The chosen transport appears in the corresponding logger.
- The From domain is authenticated when required by the Sending Service or provider.
- A controlled test transactional message reaches its recipient before a full campaign is resumed.
Frequently Asked Questions
Why is my MailPoet email stuck at 0%?
Check MailPoet > Help > System Status first. A failed Task Scheduler Connection, an overdue mailpoet/cron/daemon-trigger action, a blocked loopback request or a Sending Service connection problem can leave the queue at 0%. Open the displayed cron URL and require the exact response pong before changing the email itself.
What does a MailPoet “Connection unsuccessful” scheduler message mean?
MailPoet cannot reach the background endpoint, so queued messages cannot be processed. A homepage, login page or HTTP error instead of pong usually points to a firewall, security plugin, proxy, authentication layer, SSL problem or blocked loopback request. Your host may need to allow the route, update cURL or certificates, or raise timeout limits.
Which logger should I use for MailPoet email failures?
Use WP Mail Logging only when the site sends through WordPress wp_mail, normally the host/default method. MailPoet Sending Service, SMTP, Amazon SES and SendGrid can bypass wp_mail; enable MailPoet > Settings > Advanced > Logging and repeat one controlled test instead.
Why are MailPoet newsletters paused?
A newsletter may have been paused manually or MailPoet may have paused it after detecting a problem. Read the associated error and check System Status, the Sending Queue, provider credentials and retry count. Resume only after a targeted test succeeds; otherwise the same failure will recur.
Do I need to authenticate my domain for MailPoet Sending Service?
Yes. MailPoet requires an authenticated sending domain for Sending Service plans in response to requirements from major mailbox providers, including guidance discussed for 2024. Add the DNS records MailPoet supplies for the From domain, wait for verification, and then test delivery again.
Why do password-reset or WooCommerce emails fail while newsletters work?
Transactional messages can use a different path from newsletters. Check the active option under Send all site’s emails with…, enable the matching logger, and trigger one password reset or test order. A direct third-party provider may not queue a failed transactional message for later retry, while MailPoet Sending Service can fall back to the host.
My Post Notification is not sending even though the queue works. What should I check?
Open MailPoet > Emails > Post Notifications > View history. Confirm the notification is active, its trigger conditions match the test post, the required Automatic Latest Content block is present, the selected list contains subscribed recipients and the template renders correctly. A damaged template may require recreating the email.
MailPoet says the message was sent, but it is not in the inbox. What now?
Treat this as an inbox-placement or provider issue rather than a scheduler failure. Check spam, promotions and quarantine folders, review bounce or delivery records, authenticate the From domain, use a domain-based sender, keep From and Reply-To aligned, review suspicious links or content, and test another recipient domain.
The Bottom Line
Fix MailPoet in layers: make System Status return pong, stabilize the scheduler, identify the real sending method, authenticate the From domain, read the logger that matches that method, and test one transactional message. Only then resume a paused campaign or troubleshoot audience and inbox placement.
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