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| 421, "4.3.0", 臨時系統問題。請稍後重試 |
| 421, "4.4.5", 服務器繁忙，請稍後重試。 |
| 421, "4.7.0", IP 未列入 RCPT 網域的白名單，正在斷開連接。 |
| 421, "4.7.0", 我們的系統檢測到您的 IP 地址發出了數量龐大、來路不明的郵件。爲保護我們的用戶免受垃圾郵件的騷擾，系統暫時屏蔽了從您 IP 地址發送的郵件。有關詳情，請參閱防止發送給 Gmail 用戶的郵件遭到屏蔽或被列爲垃圾郵件。 |
| 421, "4.7.0", 臨時系統問題。請稍後重試。 |
| 421, "4.7.0", RCPT 網域需要 TLS，正在斷開連接。 |
| 421, "4.7.0", 請稍後重試，正在斷開連接。這通常表示 HELO 階段的 SMTP 中繼遇到拒絕服務攻擊 (DoS)。 |
| 450, "4.2.1", 您嘗試聯繫的用戶目前接收郵件過於頻繁。請稍後重發您的郵件。如果屆時用戶可以接收郵件，則系統將遞送您的郵件。有關詳情，請參閱收發郵件的限制。 |
| 450, "4.2.1", 您嘗試聯繫的用戶目前接收郵件過於頻繁，因此係統無法遞送更多郵件。請稍後重發您的郵件。如果屆時用戶可以接收郵件，則系統將遞送您的郵件。有關詳情，請參閱收發郵件的限制。 |
| 450, "4.2.1", 客戶的最高 SMTP 中繼量超出限制。此錯誤是暫時性的。有關 SMTP 中繼限制的詳細信息，請與您的管理員聯繫或參閱 SMTP 中繼服務錯誤消息。 |
| 451, "4.3.0", 郵件服務器暫時拒絕接收郵件。 |
| 451, "4.3.0", 單次郵件操作不可包含多個目標網域。請重試。 |
| 451, "4.4.2", 超時 - 正在斷開連接。 |
| 451, "4.5.0", 違反 SMTP 協議，請參閱 RFC 2821。 |
| 452, "4.2.2", 您嘗試通信的收件人的電子郵件帳號已超出配額。請引導收件人清理 Google 雲端硬盤空間和增加存儲空間。 |
|
452, "4.5.3", 已超過每次操作所允許的網域政策大小，請單獨向此收件人發送郵件。 |
| 452, "4.5.3", 您的郵件包含的收件人過多。要了解有關 Google 發送限制的詳細信息，請參閱收發郵件的限制。 |
| 454, "4.5.0", 違反 SMTP 協議，不允許在 STARTTLS 之後傳輸任何命令，請參閱 RFC 3207。 |
| 454, "4.7.0", 臨時系統問題導致無法進行身份驗證。請稍後重試。 |
| 454, "5.5.1", 不可重複執行 STARTTLS。 |
| 501, "5.5.2", 無法對響應進行解碼。 |
| 501, "5.5.4", HELO/EHLO 參數無效。詳情請參閱 HELO/EHLO 電子郵件錯誤。 |
| 502, "5.5.1", 無法識別的命令過多，正在斷開連接。 |
| 502, "5.5.1", 尚未實現命令。 |
| 502, "5.5.1", 無法識別命令。 |
| 503, "5.5.1", "先執行 EHLO/HELO。 |
| 503, "5.5.1", 先執行 MAIL。 |
| 503, "5.5.1", 先執行 RCPT。 |
| 503, "5.7.0", 不允許更改身份。 |
| 504, "5.7.4", 無法識別身份驗證類型。 |
| 530, "5.5.1", 需要進行身份驗證。有關詳情，請參閱無法登錄您的 Google 帳號。 |
| 530, "5.7.0", 必須先發出 STARTTLS 命令。 |
| 535, "5.5.4", 該身份驗證模式不允許使用可選參數。 |
| 535, "5.7.1", 需要應用專用密碼。有關詳情，請參閱使用應用專用密碼登錄。 |
| 535, "5.7.1", 請使用網絡瀏覽器進行登錄，然後重試。有關詳情，請參閱通過其他電子郵件平臺查看 Gmail。 |
| 535, "5.7.1", 系統不接受用戶名和密碼。有關詳情，請參閱無法登錄您的 Google 帳號。 |
| 550, "5.1.1", 您嘗試向其發送郵件的電子郵件帳號不存在。請再次仔細檢查收件人的電子郵件地址，確保沒有拼寫錯誤或多餘空格。有關詳情，請參閱解決電子郵件被退回或遭拒的問題。 |
| 550, "5.2.1", 您嘗試通信的收件人的電子郵件帳號已被停用。 |
| 550, "5.2.1", 您嘗試聯繫的用戶目前接收郵件過於頻繁，因此係統無法遞送更多郵件。有關詳情，請參閱收發郵件的限制。 |
| 550, "5.4.5", 已超過每日發送配額。有關詳情，請參閱電子郵件發送限制。 |
| 550, "5.4.5", 用戶的每日 SMTP 中繼量超出限制。有關 SMTP 中繼發送上限的詳細信息，請與您的管理員聯繫或參閱 SMTP 中繼服務錯誤消息。 |
| 550, "5.7.0", 已拒絕郵件中繼。 |
| 550, "5.7.0", 已拒絕發送郵件。如果發件人的帳號已停用或未在您的 Google Workspace 網域中註冊，就會發生此錯誤。 |
| 550, "5.7.1", 已超過電子郵件配額。 |
| 550, "5.7.1", 中繼憑據無效。 |
| 550, "5.7.1", 我們的系統檢測到您的 IP 地址發出了數量龐大、來路不明的郵件。爲保護我們的用戶免受垃圾郵件的騷擾，系統屏蔽了從您的 IP 地址發出的郵件。有關詳情，請參閱防止發送給 Gmail 用戶的郵件遭到屏蔽或被列爲垃圾郵件。 |
| 550, "5.7.1", 我們的系統檢測出此郵件可能屬於來路不明的郵件。爲減少發送至 Gmail 的垃圾郵件數量，系統已屏蔽此郵件。有關詳情，請參閱 Gmail 爲什麼阻止了我的郵件？ |
| 550, "5.7.1", 您用於發送郵件的 IP 無權直接向我們的服務器發送電子郵件。請改用服務提供商的 SMTP 中繼服務。有關詳情，請參閱"The IP you're using to send email is not authorized..."（您用於發送電子郵件的 IP 未經授權…） |
| 550, "5.7.1", 您發送郵件的目標（或來源）用戶或網域設置了一項政策，該政策會阻止您發送的郵件。請向您的網域管理員瞭解詳細信息。有關詳情，請參閱很抱歉，由於政策限制，目前系統無法發送您的郵件。 |
| 550, "5.7.1", 此網域拒絕接收未經身份驗證的電子郵件。 |
| 550, "5.7.1", 客戶的每日 SMTP 中繼量超出限制。有關 SMTP 中繼發送上限的詳細信息，請與您的管理員聯繫或參閱 SMTP 中繼服務錯誤消息。 |
| 550, "5.7.26", " 由於網域的 DMARC 政策的原因，不接受來自 domain-name 的未經身份驗證的電子郵件。請與 domain-name 網域的管理員聯繫。如果這是合法的郵件，請訪問控制來自您的網域未經身份驗證的郵件，瞭解 DMARC 計劃。如果郵件有效且不是垃圾郵件，請與郵件接收服務器的管理員聯繫，以確定外發郵件無法通過身份驗證檢查的原因。 |
| 552, "5.2.2", 您嘗試向其發送郵件的電子郵件帳戶已超過配額。 |
| 552, "5.2.3", 您的郵件超出了 Google 的郵件大小限制。有關詳情，請參閱通過 Gmail 郵件發送附件。 |
| 553, "5.1.2", 我們無法找到收件人的域名。請檢查是否存在拼寫錯誤，並確保您未在收件人電子郵件地址末尾輸入空格、句號或其他標點符號。 |
| 554, "5.6.0", 郵件格式錯誤。未接受。 |
| 554, "5.6.0", 郵件超過 50 個躍點，這可能是由於郵件遞送循環。 |
| 554, "5.7.0", 未經身份驗證的命令過多。 |
| 555, "5.5.2", 語法錯誤。 |
| 421, "4.3.0", Temporary System Problem. Try again later |
| 421, "4.4.5", Server busy, try again later. |
| 421, "4.7.0", IP not in whitelist for RCPT domain, closing connection. |
| 421, "4.7.0", Our system has detected an unusual rate of unsolicited mail originating from your IP address. To protect our users from spam, mail sent from your IP address has been temporarily blocked. For more information, visit Prevent mail to Gmail users from being blocked or sent to spam. |
| 421, "4.7.0", Temporary System Problem. Try again later. |
| 421, "4.7.0", TLS required for RCPT domain, closing connection. |
| 421, "4.7.0", Try again later, closing connection. This usually indicates a Denial of Service (DoS) for the SMTP relay at the HELO stage. |
| 450, "4.2.1" The user you are trying to contact is receiving mail too quickly. Please resend your message at a later time. If the user is able to receive mail at that time, your message will be delivered. For more information, visit Limits for sending & getting mail. |
| 450, "4.2.1", The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered. Please resend your message at a later time. If the user is able to receive mail at that time, your message will be delivered. For more information, visit Limits for sending & getting mail. |
| 450, "4.2.1", Peak SMTP relay limit exceeded for customer. This is a temporary error. For more information on SMTP relay limits, please contact your administrator or visit SMTP relay service error messages. |
| 451, "4.3.0", Mail server temporarily rejected message. |
| 451, "4.3.0", Multiple destination domains per transaction is unsupported. Please try again. |
| 451, "4.4.2", Timeout - closing connection. |
| 451, "4.5.0", SMTP protocol violation, visit RFC 2821. |
| 452, "4.2.2", The email account that you tried to reach is over quota. Please direct the recipient to Clear Google Drive space & increase storage. |
| 452, "4.5.3", Your message has too many recipients. For more information regarding Google's sending limits, visit Limits for sending & getting mail. |
| 452, "4.5.3", Your message has too many recipients. For more information regarding Google's sending limits, visit Limits for sending & getting mail. |
| 454, "4.5.0", SMTP protocol violation, no commands allowed to pipeline after STARTTLS, visit RFC 3207. |
| 454, "4.7.0", Cannot authenticate due to temporary system problem. Try again later. |
| 454, "5.5.1", STARTTLS may not be repeated. |
| 501, "5.5.2", Cannot Decode response. |
| 501, "5.5.4", HELO/EHLO argument is invalid. For more information, visit HELO/EHLO email error. |
| 502, "5.5.1", Too many unrecognized commands, goodbye. |
| 502, "5.5.1", Unimplemented command. |
| 502, "5.5.1", Unrecognized command. |
| 503, "5.5.1", "EHLO/HELO first. |
| 503, "5.5.1", MAIL first. |
| 503, "5.5.1", RCPT first. |
| 503, "5.7.0", No identity changes permitted. |
| 504, "5.7.4", Unrecognized Authentication Type. |
| 530, "5.5.1", Authentication Required. For more information, visit Can't sign in to your Google Account. |
| 530, "5.7.0", Must issue a STARTTLS command first. |
| 535, "5.5.4", Optional Argument not permitted for that AUTH mode. |
| 535, "5.7.1", Application-specific password required. For more information, visit Sign in using App Passwords. |
| 535, "5.7.1", Please log in with your web browser and then try again. For more information, visit Check Gmail through other email platforms. |
| 535, "5.7.1", Username and Password not accepted. For more information, visit Can't sign in to your Google Account. |
| 550, "5.1.1", The email account that you tried to reach does not exist. Please try double-checking the recipient's email address for typos or unnecessary spaces. For more information, visit Fix bounced or rejected emails. |
| 550, "5.2.1", The email account that you tried to reach is disabled. |
| 550, "5.2.1", The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered. For more information, visit Limits for sending & getting mail. |
| 550, "5.4.5", Daily sending quota exceeded. For more information, visit Email sending limits. |
| 550, "5.4.5", Daily SMTP relay limit exceeded for user. For more information on SMTP relay sending limits please contact your administrator or visit SMTP relay service error messages. |
| 550, "5.7.0", Mail relay denied. |
| 550, "5.7.0", Mail Sending denied. This error occurs if the sender account is disabled or not registered within your Google Workspace domain. |
| 550, "5.7.1", Email quota exceeded. |
| 550, "5.7.1", Invalid credentials for relay. |
| 550, "5.7.1", Our system has detected an unusual rate of unsolicited mail originating from your IP address. To protect our users from spam, mail sent from your IP address has been blocked. Review Prevent mail to Gmail users from being blocked or sent to spam. |
| 550, "5.7.1", Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, visit Why has Gmail blocked my messages? |
| 550, "5.7.1", The IP you're using to send mail is not authorized to send email directly to our servers. Please use the SMTP relay at your service provider instead. For more information, visit 'The IP you're using to send email is not authorized...'. |
| 550, "5.7.1", The user or domain that you are sending to (or from) has a policy that prohibited the mail that you sent. Please contact your domain administrator for further details. For more information, visit Sorry, a policy is in place that prevents your message from being sent. |
| 550, "5.7.1", Unauthenticated email is not accepted from this domain. |
| 550, "5.7.1", Daily SMTP relay limit exceeded for customer. For more information on SMTP relay sending limits please contact your administrator or visit SMTP relay service error messages. |
| 550, "5.7.26", " Unauthenticated email from domain-name is not accepted due to domain's DMARC policy. Please contact the administrator of domain-name domain. If this was a legitimate mail please visit Control unauthenticated mail from your domain to learn about the DMARC initiative. If the messages are valid and aren't spam, contact the administrator of the receiving mail server to determine why your outgoing messages don't pass authentication checks. |
| 552, "5.2.2", The email account that you tried to reach is over quota. |
| 552, "5.2.3", Your message exceeded Google's message size limits. For more information, visit Send attachments with your Gmail message. |
| 553, "5.1.2", We weren't able to find the recipient domain. Please check for any spelling errors, and make sure you didn't enter any spaces, periods, or other punctuation after the recipient's email address. |
| 554, "5.6.0", Mail message is malformed. Not accepted. |
| 554, "5.6.0", Message exceeded 50 hops, this may indicate a mail loop. |
| 554, "5.7.0", Too Many Unauthenticated commands. |
| 555, "5.5.2", Syntax error. |