Web Reference: DevOps & SysAdmins: Postfix maildir delivery failed - are my mails lost? (2 Solutions!!) - YouTube Find troubleshooting guides and FAQs for connections, pipelines, security, notifications, migrations, and more in Azure DevOps. Since authenticated mail always passes through Postfix unhindered, the correct answer is, if possible, to use the posted fail2ban script to keep the number of brute force attempts to a minimum.
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