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mta-sts/.well-known/mta-sts.txt

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# MTA-STS Policy File for lewsion.com
# For more information, see: https://tools.ietf.org/html/rfc8461
version: STSv1
# Policy version. Always 'STSv1' as per RFC 8461.
mode: enforce
# Policy mode. Possible values:
# enforce - Enforce the policy (recommended for production)
# testing - Report violations but do not enforce (use for testing)
# none - Disable MTA-STS
mx: mail.lewsion.com
# Primary mail server hostname (must match your DNS MX records).
# Add additional 'mx:' lines for each secondary mail server if needed.
# Example:
# mx: mx2.lewsion.com
max_age: 1209600
# Policy lifetime in seconds (e.g., 1209600 = 14 days).
# Increase for production, decrease for testing.