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我使用的Magento開發一個電子商務網站和我使用SMTP臨用谷歌應用程序或電子郵件來發送電子郵件。它的工作非常好，但幾個月後，現在當我嘗試使用自檢SMTP臨無法發送測試電子郵件
SMTP Pro Self Test Results
Sending test email to your contact form address: [email protected] from: [email protected] Unable to send test email.
Exception message was: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Please check the user guide for frequent error messages and their solutions.
Default templates exist.
Email communications are enabled.
Testing failed, please review the reported problems and if you need further help visit the support page or contact me via [email protected] for support.
這是什麼錯誤，以及如何解決它，我正在此錯誤。用戶名和提供的電子郵件密碼是正確的