microsoft 365 office outlook 이메일 자동 전달하기

Microsoft 365 outlook email service, 받은 메일을 자동으로 다른 계정으로 이메일 주소로 전달하는 방법

* 전달 설정
메일(outlook.office.com) -> 설정(우상단)
    -> 메일 -> 전달
https://outlook.office.com/mail/options/mail/forwarding


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* 에러 발생
설정한 계정(A)으로 다른 계정(B)에서 메일을 보내면 다른 계정(B)로 에러 메지시가 전달됨

     - 에러 메시지

//-------------------------------------
전자 메일을 xxx@xxx.onmicrosoft.com 다른 전자 메일 주소로 전달할 수 없습니다.
받는 사람의 전자 메일 공급자가 메시지를 거부했기 때문에 메시지가 배달되지 않았습니다.

//-------------------------------------
postmaster@xxx.onmicrosoft.com via sevp216cu002.outbound.protection.outlook.com 
6:53 PM (10 minutes ago)

to me
Why is this message in spam?
It is in violation of Google's recommended email sender guidelines.
Your email couldn't be forwarded from xxx@xxx.onmicrosoft.com to another email address.

Your message wasn't delivered because the recipient's email provider rejected it.

Diagnostic information for administrators:
Generating server: PS2P216MB1236.KORP216.PROD.OUTLOOK.COM

xxx@xxxr.onmicrosoft.com
Remote server returned '550 5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS(7555)'

//-------------------------------------
Your email couldn't be forwarded from xxx@xxx.onmicrosoft.com to another email address.

Your message wasn't delivered because the recipient's email provider rejected it.

mx.google.com gave this error:
[2a01:111:f403:c410::1] The IP address sending this message does not have a PTR record setup, or the corresponding forward DNS entry does not match the sending IP. As a policy, Gmail does not accept messages from IPs with missing PTR records. For more information, go to https://support.google.com/a?p=sender-guidelines-ip To learn more about Gmail requirements for bulk senders, visit https://support.google.com/a?p=sender-guidelines. 6a1803df08f44-6b761a02ea8si94814236d6.255 - gsmtp 


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=> 해결 방법

아웃바운드 스팸 방지 정책 관리 설정

     - 매뉴얼
https://learn.microsoft.com/en-us/defender-office-365/outbound-spam-policies-external-email-forwarding

     - 설정 방법
Microsoft Defender(security.microsoft.com) -> 정책 및 규칙 -> 위협 정책 -> 스팸 방지
https://security.microsoft.com/antispam
스팸 방지 아웃바운드 정책 -> 보호 설정 편집 -> 자동 전달 규칙 : 켜기
     - 설정후 적용되는데 10분 이상 걸림