またSpamhausのCSSブロックリストに登録された(IPv6)
またSpamhausのCSSブロックリストに登録されてサーバーからメール送信できなくなったので調査したときの覚書。 Gemini 3 Pro Previewと対話。 環境: FreeBSD 14.3-RELEASE-p7 amd64, Postfix 3.10.6 Postfixのバージョン確認。 # postconf mail_version 1. 送信メールがブロックされた理由 maillogを確認。 # less /var/log/maillog jp.mail.protection.outlook.com[2a01:...::] said: 550 5.7.1 Service unavailable, Client host [2400:...:135] blocked using Spamhaus. To request removal from this list see https://www.spamhaus.org/query/ip/2400:...:135 AS(1440) [OS3PEPF0000003E.JPNP286.PROD.OUTLOOK.COM 2026-01-31T20:00:10.242Z 08DE60A93EBF9B50] (in reply to RCPT TO command)) maillogのURLにアクセスすると下記メッセージ。 CSS Blocklist - Why is this IP address listed? Your IP address is either exhibiting suspect behavior, is misconfigured, or has a poor sending reputation. As a result, this IP is listed in the CSS Blocklist (CSS) Click on More Info to see if you can request a delisting from this blocklist. This will also display any further information we have relating to this listing. Less Info Why is 2400:...