hotmail.com으로 보내는 메일이 오류가 납니다.

Question

SMTP통신을 통해 hotmail 측으로 메일을 발송하였는데, 아래와같은 통신로그를 받았습니다.

[2025/07/17 04:38:28][193607243][ k*********@hotmail.com][ 0][ 1][ 1][R][451]4.7.650 The mail server [116.67.113.41] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see https://postmaster.live.com ($775) [Name=Protocol Filter Agent][AGT=PFA][MxId=11BB87E21AF0379F][https://www.google.com/search?q=SJ5PEPF00000205.namprd05.prod.outlook.com 2025-07-16T19:38:28.928Z 08DDC3F10E94B7EC]]

확인부탁드립니다.

Answer 1

Hi,

From what I check it appears that you are encountering SMTP error code 451 4.7.650 temporary rate limiting due to poor IP reputation indicates that Microsoft is throttling your mail server because it suspects spam-like behavior or poor reputation. Its a temporary block.

Next Step:

1. Reduce the volume of outbound emails temporarily
2. Avoid sending to large recipient list or using suspicious URL's
3. Disconnect VPN if used and Antivirus app that might block the IP address you used

For further troubleshooting, you can also Request to Delisting your IP by going to this link: https://postmaster.live.com/

Also, you can see for yourself and check your IP Reputation through this link: https://sendersupport.olc.protection.outlook.com/snds/index.aspx