Web Reference: Jun 26, 2025 · Learn how to troubleshoot Postfix 'too many connections' errors after a server upgrade. Discover common causes, configuration adjustments, and expert tips to restore email deliverability. Oct 18, 2018 · RSET is considered a junk command and the default smtpd_junk_command_limit is 100. Once this limit is reached, the hard_error count starts going up. When that hits 20 (default), totalling 120 overall, Postfix reports too many errors. DevOps & SysAdmins: postfix/smtp: refused to talk to me: 451 too many connection attempts Helpful?
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