Two mailserver-namespace log-noise cleanups (cluster's #1 Loki error
source, from the 2026-06-06 log triage):
1. TLS warning: docker-mailserver SSL_TYPE=manual writes the authoritative
smtpd_tls_chain_files at boot, so the legacy smtpd_tls_cert_file/key_file
in our postfix-main.cf override were IGNORED and triggered postfix's
'Both smtpd_tls_chain_files and ... legacy ...' warning. Dropped the two
legacy lines (functional no-op; chain_files already wins). Verified via
live postconf.
2. Scanner noise (~9k lines/hr): narrow Alloy stage.drop for the benign
public-SMTP probe patterns (unknown[unknown] SSL_accept resets, postscreen
half-open drops, rate-limit-exceeded from unknown). Real delivery logs +
real-IP SASL failures KEPT; CrowdSec bans these IPs independently, so
security posture is unchanged. Validated with 'alloy fmt' (exit 0).
Reversible.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
8a3bbde38c