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Email authentication
MTA-STS
A comprehensive collection of questions and answers about MTA-STS email authentication from email marketers, experts and technical documentation.
What is the file name for an MTA-STS policy?
Does MTA-STS require DNSSEC for policy discovery?
What DNS record type is used for MTA-STS policy discovery?
What is the purpose of the 'id' tag in an MTA-STS policy TXT record?
What is the 'version' field in an MTA-STS policy?
What port does MTA-STS typically use for policy fetching?
Does MTA-STS protect against downgrade attacks?
What is the 'mode' field in an MTA-STS policy?
What is the directory path for the MTA-STS policy file?
Does MTA-STS provide sender authentication?
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