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    • Emails are not sent from or to a Plesk server: 450 4.7.1 Client host rejected

    1. https://support.plesk.com
    2. en-us
    3. articles
    4. 1237714009...

    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 ...


    SMTP Email Error 450 4.7.1 - How to Resolve [SOLVED] - Warmy.io

    1. https://blog.warmy.io
    2. blog
    3. how-to-fix-smtp-email-err...

    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 ...


    Explanation of the bounce-back message - Openfind

    1. https://openfind.zendesk.com
    2. en-us
    3. articles
    4. 5336724...

    2024/12/11 -For example, the following message indicates that it was rejected by the recipient's mail server, the reason is: DNS Unable to locate sender address. IP The ...


    [SOLVED] BIND: Lots of query failures after upgrading to 9.18 ?

    1. https://www.linuxquestions.org
    2. questions
    3. slackware-14

    2024/10/8 -199.83]: 450 4.7.1 Client host rejected: cannot find your reverse hostname,. Looking at /var/log/messages on both servers. I'm seeing lots of query failures ...


    regex - Postfix: exempt from `reject_unknown_helo_hostname ...

    1. https://serverfault.com
    2. questions
    3. postfix-exempt-from-...

    2024/10/31 -I'm using Postfix 3.5.8, and I want given servers matching a regexp (from their reverse DNS lookup) to be exempt from unknown host lookup in their HELO command.


    Email non-delivery report (NDR) and SMTP errors in Exchange Online

    1. https://learn.microsoft.com
    2. ...
    3. Troubleshooting

    2024/10/20 -This error occurs if the presented certificate identities (CN and SAN) of a destination SMTP target host don't match any of the domains or MX host. This message ...


    特定の相手先のみ逆引き不具合のようなエラーがでてメール送信が ...

    1. https://helpcenter.gmocloud.com
    2. article

    2024/9/27 -... 450 4.7.1 Client host rejected: cannot find your reverse hostname, [名前解決できないIPアドレス]. このような場合、送信元IPアドレスの固定化を行うことで改善され ...


    急に送信が不可能になりました。アカウントなどの変更も出来ません。

    1. https://answers.microsoft.com
    2. forum
    3. all
    4. 急に送信が

    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 ...


    AbuseIPDB » 155.94.155.104 - Railnet LLC

    1. https://www.abuseipdb.com
    2. check

    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 ...


    Proxmox Mail Gateway Administration Guide

    1. https://pmg.proxmox.com
    2. pmg-docs
    3. pmg-admin-guide

    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 ...