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postfix: raise smtpd_client_connection_rate_limit 10 → 100 #63

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Merged
prim-8 merged 1 commit into from
May 4, 2026
Merged

postfix: raise smtpd_client_connection_rate_limit 10 → 100 #63

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6 changes: 5 additions & 1 deletion postfix/postfix-main.cf.template
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,11 @@ command_time_limit = 30s
maillog_file = /var/log/postfix.log

# Rate limiting - prevent abuse/DoS
smtpd_client_connection_rate_limit = 10
# Connection rate limit is per source IP per anvil_rate_time_unit.
# 10 was too low for load testing (20 concurrent users from one IP exhausted
# the limit in ~10s, causing connection resets for users 11-20). 100 allows
# realistic concurrency headroom while still protecting against DoS.
smtpd_client_connection_rate_limit = 100
smtpd_client_message_rate_limit = 50
smtpd_client_recipient_rate_limit = 100
anvil_rate_time_unit = 60s
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