Overview The ‘SMTP error 451-4.3.0’ typically indicates a temporary issue on the mail server’s side. This error can prevent your site emails from being successfully sent to the intended recipient(s). Causes There are several reasons why the ‘SMTP error 451 4.3.0’ might occur. These are the most common causes: Network issues: Temporary problems with your […]
Error: SMTP2GO E_ApiResponseCodes: ENDPOINT_PERMISSION_DENIED
Overview The ‘SMTP2GO E_ApiResponseCodes.ENDPOINT_PERMISSION_DENIED’ error typically occurs when sending emails through the SMTP2GO email service. It indicates the API key you configured doesn’t have permission to send emails. Causes The primary cause of this error is using an API key that doesn’t have the correct permissions to send emails on your behalf. Solution To resolve […]
Error: cURL Error
Overview cURL errors often indicate that your server’s cURL library is outdated or incompatible with your SMTP plugin. These errors are typically server-related rather than issues with the SMTP plugin itself. Causes There are two main reasons why cURL errors occur: Outdated cURL library: Your server’s cURL library may be outdated, leading to compatibility issues. […]
cURL Error 28: Connection Timed Out
Overview The cURL error 28 indicates a timeout occurred when your site attempted to make an HTTP request to the server. This error often happens if your server fails to respond to your chosen mailer’s request in a timely manner. Causes There are several reasons why cURL error 28 might occur: Server-related issues: Your server’s […]
SMTP Error: Key Not Found
Overview The ‘Key Not Found’ error usually means that a required configuration key, such as an API key, is missing or incorrectly set in your SMTP plugin. This can prevent emails from being sent successfully through your site. Causes Most email service providers (like SendLayer and Brevo) require an API key or authentication token for […]
SMTP Error: MailboxNotEnabledForRESTAPI
Overview The “MailboxNotEnabledForRESTAPI” error occurs when a mailbox isn’t enabled to use the REST API (used by applications to access mail, send emails, and other services in Exchange Online or Office 365). This can happen for several reasons, often relating to the type of mailbox or its settings. Causes This error often occurs when using […]