happyDeliver/docker/opendkim/opendkim.conf

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# OpenDKIM configuration for happyDeliver
# Verifies DKIM signatures on incoming emails
# Log to syslog
Syslog yes
SyslogSuccess yes
LogWhy yes
# Run as this user and group
UserID opendkim:mail
UMask 002
# Socket for Postfix communication
Socket unix:/var/spool/postfix/opendkim/opendkim.sock
# Process ID file
PidFile /var/run/opendkim/opendkim.pid
# Operating mode - verify only (not signing)
Mode v
# Canonicalization methods
Canonicalization relaxed/simple
# DNS timeout
DNSTimeout 5
# Add header for verification results
AlwaysAddARHeader yes
# Accept unsigned mail
On-NoSignature accept
# Always add Authentication-Results header
AlwaysAddARHeader yes
# Maximum verification attempts
MaximumSignaturesToVerify 3