Q:the server says:550 relaying mail to <> is not allowed
Q:The server says:550 <>... relaying denied
Q:the server says:550 5.7.1 relaying not permitted:
A:使用某些Smtp服務器時，限制了收件人的地址，只能換一個Smtp服務器。
Q:The server says:550 <>:local user only
Q:The server says:550 <>:Invalid User
Q:The server says:550 Invalid recipient
A:使用163.net，163.com，yeah.net和netease.com之類的Smtp服務器時，只能用自身的信箱發信，所以要在Foxmail的“帳戶屬性”中的“個人信息”里面填寫正確的郵件地址。
Q:the server says:551 delivery not allowed to non-local recipient
Q:The server says:553 Relay restriction.
Q:The server says:553 From <>, message blocked.
Q:The server says:553 sorry,you are not allow to use this SMTP to relay your eami
Q:The server says:553 sorry, that domain isn@#t in my list of allowed rcpthosts
A:使用21cn.com，china.com，371.net，sina.com等大多數信箱的smtp服務器時，只能用自身的信箱發信，所以要在Foxmail的“帳戶屬性”中的“個人信息”里面填寫正確的郵件地址。
Q:The server says:505 client was not authenticated
Q:The server says:553 authentication is required to send mail as <>
A:使用263.net和sohu.com的Smtp服務器時，不但要用自身的郵箱發信，而且要加入身份驗證，所以即要在“個人信息”中填寫正確郵箱地址，又要選中“S MTP服務器需要認證”。
Q:The server says:535 Error:authenticatin failed
Q:The server says:535 Authentication unsuccessful
Q:The server says:452 Insufficient system storage
A:在使用Esmtp認證的過程中出錯，檢查一下Esmtp設置，多試幾次。
Q:The server says:553 <>...domain name required
Q:The server says:550 Unable to relay for ...
A:多出現在用Wingate代理服務器發送郵件時。雖然在Wingate中“POP3 郵箱帳號”要使用“用戶名#POP3地址”的格式，但在“帳戶屬性”中的“個人信息”中還是要填寫一般的格式。
Q:The server says:553 mailbox name not allowed
A:收件人郵箱地址不允許，需檢查收件人地址是否正確。
Q:the server says:553 sorry, your envelop sender is in my badmailfrom list
A:服務器限制了收件人的地址，只能換一個smtp服務器發信。
Q:the server says:554 Transaction failed
Q:The server says:451 Requested action aborted,errno=28
A:傳輸失敗，檢查網絡問題。
Q:the server says:503 error:needmail command
Q:The server says:503 need mail before RCPT.
Q:The server says:503 Bad sequence of commands
A:消息命令順序出錯，一般出現在其他錯誤之后，先檢查之前出現的錯誤提示。
Q:The Server says:501 syntax.helo hostname
Q:The server says:501 Invalid domain name
Q:The server says:502 unimplemented command
Q:the server says:503 5.0.0 polite people say HELO first
Q:The server says:533 relay restriction
Q:The server says:544 <>:Recipient address rejected: Relay access denied
A:傳輸中的語法錯誤，原因不明。
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