• 10-23 > 退信提示：“User reject。”
• 10-23 > 退信提示：“451 Requested action aborted：local error in processing”
• 10-23 > 退信提示：“MD Server Error 5：database error.”
• 10-23 > 退信提示：“SMTP error,RCPT TO：550 USe mail relays of your ISP”
• 10-23 > 退信提示：“554 5.7.0 message size violation”
• 10-23 > 退信显示：您的邮件大小超过收件方（google）服务器对于邮件大小的限制。（Your message exceeded Google's message size limits）
• 10-23 > 退信提示：“550 5.7.1 Recipient not authorized, your IP has been found on a block list”
• 10-23 > 退信提示：“MAIL FROM： 550 5.0.0 Mail rejected due to possible SPAM。”
• 10-23 > 退信提示：“delivery temporarily suspended：connect to mail.abc.com[xxx.xxx.xx.xx]：Connection timed out”
• 10-23 > 退信提示：“550 abc@domain：mailbox limit exceeded (inreply to end of DATA command)”
• 10-23 > 退信提示报错“domain abc.com MX query return retry”
• 10-23 > 退信提示：“501： domain missing or malformed”
• 10-23 > 退信提示：“550 Sender domain must exist ”
• 10-23 > 退信提示：“Host abc.com(xxx.xxx.xx.xx) MAIL FROM said 451
• 10-23 > 退信提示：“Host abc.com(xxx.xxx.xxx.xx) RCPT TO said 421 Refused. You have no reverse DNS entry. Contact abuse@abc.com for details”
• 10-23 > 退信提示：“No MX or A records for abc.com”
• 10-23 > 退信提示：“SMTP error, DOT： 554 5.7.1 This message has been blocked because the return email domain is invalid.(failed to obtain DNS record for domain abc.com)”
• 10-23 > 退信提示：“SMTP error, MAIL FROM：553 SPF check refused(softfail)”
• 10-23 > 退信提示：“SMTP error, RCPT TO： 550 [PERMFAIL] abc.com requires valid sender domain”
• 10-23 > 退信提示：“SMTP error, RCPT TO：550 No such domain at this location”

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