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This is the first chapter in my book.
421 Service not available, closing transmission channel (This may be a reply to any command if the service knows it must shut down) 450 Requested mail action not taken: mailbox unavailable (E.g., mailbox busy) 451 Requested action aborted: local error in processing 452 Requested action not taken: insufficient system storage 500 Syntax error, command unrecognized (This may include errors such as command line too long) 501 Syntax error in parameters or arguments 502 Command not implemented 503 Bad sequence of commands 504 Command parameter not implemented 550 Requested action not taken: mailbox unavailable (E.g., mailbox not found, no access) 551 User not local; please try 552 Requested mail action aborted: exceeded storage allocation 553 Requested action not taken: mailbox name not allowed (E.g., mailbox syntax incorrect) 554 Transaction failedThe other codes that provide you with helpful information about what’s happening with your messages are: 211 System status, or system help reply 214 Help message (Information on how to use the receiver or the meaning of a particular non-standard command; this reply is useful only to the human user) 220 Service ready 221 Service closing transmission channel 250 Requested mail action okay, completed 251 User not local; will forward to 354 Start mail input; end with . (a dot) ‘************************* ‘* 郵件服務返回代碼含義 ‘* 500 格式錯誤，命令不可識別（此錯誤也包括命令行過長） ‘* 501 參數格式錯誤 ‘* 502 命令不可實現 ‘* 503 錯誤的命令序列 ‘* 504 命令參數不可實現 ‘* 211 系統狀態或系統幫助響應 ‘* 214 幫助信息 ‘* 220 服務就緒 ‘* 221 服務關閉傳輸通道 ‘* 421 服務未就緒，關閉傳輸通道（當必須關閉時，此應答可以作為對任何命令的響應） ‘* 250 要求的郵件操作完成 ‘* 251 用戶非本地，將轉發向 ‘* 450 要求的郵件操作未完成，郵箱不可用（例如，郵箱忙） ‘* 550 要求的郵件操作未完成，郵箱不可用（例如，郵箱未找到，或不可訪問） ‘* 451 放棄要求的操作；處理過程中出錯 ‘* 551 用戶非本地，請嘗試 ‘* 452 系統存儲不足，要求的操作未執行 ‘* 552 過量的存儲分配，要求的操作未執行 ‘* 553 郵箱名不可用，要求的操作未執行（例如郵箱格式錯誤） ‘* 354 開始郵件輸入，以.結束 ‘* 554 操作失敗 ‘* 535 用戶驗證失敗 ‘* 235 用戶驗證成功 ‘* 334 等待用戶輸入驗證信息