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• 退信提示：500 Line too long
• 退信提示：550 Sender has no A, AAAA, or MX DNS records
• 退信提示：550 Relaying mail to xxx@xxx.com.tw is not allowed
• 退信提示：554 mail server permanently rejected message (#5.3.0)
• 退信提示：552 Sorry, your host is blocked by spam detection system
• 退信提示：554 5.7.1 Client host rejected: Access denied
• 退信提示：451 Failed to store message for
• 退信提示：550 5.7.1 message content rejected
• 退信提示：Could not connect to 0.0.0.0 on port 25 since this would mean connecting to myse
• 退信提示：421 4.4.5 Service not available, too many connections, code=CL82
• 退信提示：550 Mail is rejected by recipients
• 退信提示：550 Backend Replied [xxx.mxlogic.net]:Denied by policy (Mode: normal)
• 退信提示：554 Content filter will not allow this message
• 退信提示：554 5.7.1 This message has been blocked because ASE reports it as spam
• 退信提示：550 Denied by policy
• 退信提示：550 ACL:RE Hit acl, permission deny
• 退信提示：550 5.7.0 Local Policy Violation. Check SPF
• 退信提示：553 sorry, you must authentication
• 退信提示：Requested mail action not taken: Invalid IP
• 退信提示：554 rejected due to spam URL in content
• 退信提示：552 5.1.1 Mailbox delivery failure policy error
• 退信提示：598 maillist rejected
• 退信提示：554 5.7.1 Delivery not authorized
• 退信提示：554 rcpt is rejected: 218
• 退信提示：554 5.6.1 Body type not supported by Remote Host
• 退信提示：Recipient address rejected:ERS-QIL