退信

• 退信提示："NULL sender is not allowed"
• 退信提示："syntax error"
• 退信提示："bad syntax"
• 退信提示："You are not allowed to send email to this user"
• 退信提示："Requested action not taken: no smtp MX only"
• 退信提示："582 this message could not be delivered."
• 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："Requested action not taken: Local user only"
• 退信提示："not found in LDAP serve"
• 退信提示："No such person at this address"
• 退信提示："User unknown in virtual alias table"
• 退信提示："The email account that you tried to reach does not exist"
• 退信提示："A not found"
• 退信提示："User suspended"
• 退信提示："This target address is not our MX service"