• 10-23 > 退信提示：“SMTP error, RCPT TO：553 5.7.1 sorry, that domain isn't in my list of allowed rcpthosts (chkuser)”
• 10-23 > 退信提示：“UnKnown can't find abc.com： Non-existent domain”
• 10-23 > 邮件被收件方拒收，收件方返回退信说明 “550 Mailbox not found”。
• 10-23 > 退信提示：“501 5.7.1 Sender refused by the DNSBL zen.spamhaus.org.”
• 10-23 > 退信提示：“550 5.7.1 xxx.xxx.xxx.xxx has been blocked by SBL+.”
• 10-23 > 退信提示：“550 Senderis in blacklist”
• 10-23 > 退信提示：“Host abc.com(xxx.xxx.xxx.xxx) MAIL FROM said 453 Blocked by NSBL。”
• 10-23 > 退信提示：“SMTP error, DOT：519 Rejected.”
• 10-23 > 退信提示：“SMTP error, DOT：519 Rejected.”
• 10-23 > 退信提示：“SMTP error, RCPT TO：550 Host xxx.xxx.xx.xx has been banned from this server (5).”
• 10-23 > 退信提示：“SMTP error, RCPT TO：550 Use mail relays of your ISP..”
• 10-23 > 退信提示：“550 unavailable mail user.”
• 10-23 > 退信提示：“550 5.1.0 Address rejected abc@yourdomain.com.”
• 10-23 > 退信提示：“550 5.1.1 User unknown.”
• 10-23 > 退信提示：“550 This account is not allowed... abc@abc.com”
• 10-23 > 退信提示：“550 Unrouteable address”
• 10-23 > 退信提示：“554 delivery error：dd This user doesn't have a yahoo.com account (abc@yahoo.com)”
• 10-23 > 退信提示：“Host abc.com(xxx.xxx.xx.xx) DOT said 421 Syntax error.”
• 10-23 > 退信提示：“mailbox 123@abc.com is restricted。”
• 10-23 > 退信提示报错 “DNS query error：abc.com”

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