Notifications are not being sent

Staff or customers stop receiving email. Three layers to check.

Is the queue moving?

Notifications are queued and dispatched by a background job. If the job is not running, the queue grows and nothing sends. Admin → Background tasks shows the last run.

Is SMTP working?

Send a test from Admin → Settings. Authentication failures here are usually a changed password or a provider requiring an app-specific password.

Is it being delivered but filtered?

Check the recipient’s spam folder. If mail lands there, the fix is SPF, DKIM and DMARC rather than anything inside the application.