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• 退信提示：553 5.1.3 … Invalid route address
• 退信提示：553 host denies relay (umail mta)
• 退信提示：543 involves illegal information
• 退信提示：550 Unrouteable address
• 退信提示：550 relaying denied for xxxx@yahoo.cn
• 退信提示：550 5.7.1 Client host rejected: Your message was rejected due to spam filtering
• 退信提示：554 Reject by behaviour spamantispam_bat
• 退信提示：550 5.5.0 121.50.xx.xx is blacklisted by FortiGuard
• 退信提示：553 We have reason to believe this mail is spam
• 退信提示：554 Rejected due to the sending MTA's poor reputation
• 退信提示：421 4.7.1 Intrusion prevention active for
• 退信提示：550 5.7.1 Our system has detected that this message is likely unsolicited mail
• 退信提示：550 The host name specified in HELO does not match IP address
• 退信提示：550 JunkMail rejected 121.50.xx.xx is in an RBL on rbl.websitewelcome.com
• 退信提示：421 Sorry, SMTP server too busy right now (90) try again later
• 退信提示：550 You are blacklisted
• 退信提示：554 Message not allowed - [299]
• 退信提示：553 refused, SPF check softfail
• 退信提示：554 Service unavailable; Client host blocked by dnsbl.ahbl.org
• 退信提示：550 The domain sg-international.com is currently suspended. Try later.
• 退信提示：553 #5.1.8 Domain of sender address does not exist
• 退信提示：598 ip address in blacklist for more details Please see
• 退信提示：554 5.5.1 Error: no valid recipients
• 退信提示：421 connection limit exceeded
• 退信提示：554 A.16 xx@xxxx.com… in user's email,domain blacklist(Header From)
• 退信提示：554 5.7.1 DAS41 Your mail is blocked automatically by anti-spam system. (E04)