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Related to email protocols, clients, servers, content, and message format.

3 votes
1 answer
1k views

What are the risks of an MTA-STS policy with a long max_age?

In setting up SMTP MTA Strict Transport Security (RFC 8461) for my domain, I've noticed some contradictory advice and practice: although the maximum value for the max_age policy value is around one ye …
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