退信

• 退信提示："MI:SPF"
• 退信提示："SMTP error，DOT：550 abc.com has no A,AAAA,,or MX DNS records…"
• 退信提示："SMTP error, RCPT TO：550 No such domain at this location"
• 退信提示："SMTP error, RCPT TO： 550 + [PERMFAIL] abc.com requires valid sender domain"
• 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)"
• 退信提示："550 Sender domain must exist"
• 退信提示："501： domain missing or malformed"
• 退信提示："SMTP error, RCPT TO：550 No such domain at this location"
• 退信提示："SMTP error, RCPT TO： 550 + [PERMFAIL] abc.com requires valid sender domain"
• 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)"
• 退信提示："550 Sender domain must exist"
• 退信提示："501： domain missing or malformed"
• 退信提示："450 Query Domain Retry(DNS retry)"
• 退信提示："No MX or A records for abc.com"
• 退信提示："SMTP error, MAIL FROM：553 sorry, your envelope sender domain must exist"