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IPv6 주소에 대해 DNS의 reverse domain 이 잘못 설정된 경우, 상대편에서 스팸으로 의심하고 block
코드 블럭 |
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This is the mail system at host lists.kreonet.net.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<****@yonsei.ac.kr>: host aspmx.l.google.com[2404:6800:4008:c03::1b] said:
550-5.7.1 [2001:320:11:248:546f:4bff:fef8:c9] Gmail has detected that this
550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR
records 550-5.7.1 and authentication. For more information, go to 550
5.7.1
https://support.google.com/mail/?p=IPv6AuthError
41be03b00d2f7-78e41c8cf4dsi11013936a12.313 - gsmtp (in reply to end of
DATA command) |
MX record does not exist
리스트 서비스 도메인에 MX 레코드가 설정되지 않은 경우, 상대편에서 스팸으로 의심하고 block
코드 블럭 |
---|
This is the mail system at host lists.kreonet.net.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<****@kins.re.kr>: host spam.kins.re.kr[203.250.169.30] said: 553 [Sniper]
Sender domain MX record does not exist. (in reply to MAIL FROM command) |
Mailbox unavailable
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