2025/3/4 -Resolution. Contact the server provider of the IP address in order to correct PTR record and make it point to the mail server hostname. For Plesk hosted ...
2025/5/24 -450 4.7.1 “Client Host Rejected” – The receiving server has flagged your server or IP due to reputation issues or policy settings. Check your sender ...
2025/2/7 -突然、送信のみ不可能になりました。送信するとサーバーエラー450 4・7・1 クライアントホストレジェクテッドキャンノットファインドユアレバースホストナームという表記の ...
2025/6/23 -155.104. Check an IP Address, Domain Name, or Subnet e.g. 66.249.68.68, microsoft.com, or 5.188.10.0/24. Check. 155.94.155.104 was found in our database! This ...
2025/6/23 -This article contains information on common Mimecast 5xx SMTP error codes, their causes, and recommended resolutions to address issues.
2025/2/27 -Check the IP configuration and hostname. Check the timezone. Check your Firewall settings. Configure Proxmox Mail Gateway to forward the incoming SMTP traffic ...
2025/3/12 -메일 서버에 대해 Reverse DNS를 등록하면 문제가 해결됩니다. 일반적인 DNS는 이름을 사용해 IP를 찾지만 Reverse DNS는 반대로 IP를 이용해 이름을 찾는 것입니다. 최근 ...
2025/6/11 -Old Reports: The most recent abuse report for this IP address is from 3 weeks ago . It is possible that this IP is no longer involved in abusive activities.
2025/6/10 -I am using Symantec Messaging gateway 10.7.4-13 and I cannot find how to tag external emails to warn users this email has come from outside the company, all my ...
2025/2/5 -This error is temporary—meaning the receiving server temporarily refuses to receive messages. Reasons range from security policies, server restrictions, spam ...