451 4.3.5 <ivy@ubddns.org>: Recipient address rejected: Server configuration problem

mail smtp spf ublink.org

林門神JanusLin 2026-05-09 06:39:55 ‧ 224 瀏覽

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Mail Server
SMTP MTA syslog

451 4.3.5 ivy@ubddns.org: Recipient address rejected: Server configuration problem; from=ruru@ublink.org to=ivy@ubddns.org proto=ESMTP helo=<sxx.ublink.org>

有開啟 SFP Check
SMTP Log 出現
warning: problem talking to server private/spf: Connection timed out
warning: problem talking to server private/spf: Connection timed out
DNS 查詢時間太長

Mail Server 主要DNS 更換一個試試
還要檢查
網路節點是否有 IDP IPS 資安艦隊防火牆的防護設備