163经销代理服务商：深圳市阔步实业有限公司

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• 退信提示：“501 5.7.1 Sender refused by the DNSBL zen.spamhaus.org.”
• 退信提示：“550 5.7.1 xx.xx.xx.xx has been blocked by SBL+.”
• 退信提示：“550 Senderis in blacklist”
• 退信提示：“Host abc.com(xx.xx.xx.xx) MAIL FROM said 453 Blocked by NSBL。
• 退信提示：“SMTP error, DOT：519 Rejected.”
• 退信提示：“SMTP error, RCPT TO：550 Host xx.xx.xx.xx has been banned from this server (5).”
• 退信提示：“SMTP error, RCPT TO：550 Use mail relays of your ISP..”
• 退信提示：“550 unavailable mail user.”
• 退信提示：“550 5.1.0 Address rejected abc@abcd.com.”
• 退信提示：“550 5.1.1 User unknown.”
• 退信提示：“550 Mailbox not found”
• 退信提示：“550 This account is not allowed... ab@ab.com”
• 退信提示：“550 Unrouteable address”
• 退信提示：“553 5.3.0 ... No such user.”
• 退信提示：“554 delivery error：dd This user doesn't have a yahoo.com account (abc@163.com)”
• 退信提示：“Host abc.com(xx.xx.xx.xx) DOT said 421 Syntax error.”
• 退信提示：“RCPT TO：550 Disabled.”
• 退信提示：“Recipient address rejected：User unknown in virtual mailbox table”
• 退信提示：“SMTP error, DATA：554 One or more of the sender or recipients in your email are invalid and not accepted.”
• 退信提示：“SMTP error, RCPT TO：550 5.2.1 The email account that you tried to reach is disabled.”
• 退信提示：“The email account that you tried to reach does no exists.”
• 退信提示：“mailbox 123@1631.com.cn is restricted。”
• 退信提示：“recipient does not have an account.”
• 退信提示：“550 5.7.1 Message rejected as spam by Content Filtering.”
• 退信提示：“550 5.9.4 rejected by system”
• 退信提示：“550 Error：mail rejected by antispam server.”