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With email in outbox: Failed to send some messages. Negative SMTP reply 501 5.1.3 Bad recipient address syntax · Issue #1328 · thundernest/k-9 · GitHub
With email in outbox: Failed to send some messages. Negative SMTP reply 501 5.1.3 Bad recipient address syntax · Issue #1328 · thundernest/k-9 · GitHub
解決した!】サーバー エラー 501.5.1.3 Bad recipient address syntaxの原因と解決手順 | ホームページ・インフラ担当が副業やるってよ
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501 5.1.7 Bad sender address syntax - Technical assistance - Zammad - Community