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Email authentication
MTA-STS
A comprehensive collection of questions and answers about email authentication mta-sts 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?
Does MTA-STS ensure end-to-end encryption?
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?
What is the 'mx' field in an MTA-STS policy used for?
Does MTA-STS apply to inbound or outbound mail?
What is the 'max_age' field in an MTA-STS policy?
Does MTA-STS work with any TLS certificate?
What HTTP status code should an MTA-STS policy file return on success?
Does MTA-STS prevent email content modification?
What are the three possible 'mode' values in an MTA-STS policy?
Does MTA-STS require a specific root certificate authority?
What is the purpose of the '_mta-sts' DNS subdomain?
Does MTA-STS use a public key infrastructure for validation?
What is the 'policy_text_version' in MTA-STS?
Does MTA-STS ensure email deliverability?
What is the 'enforce' mode in MTA-STS?
Does MTA-STS use SMTP or HTTPS for policy retrieval?
What is the 'testing' mode in MTA-STS?
Does MTA-STS affect email routing decisions?
What is the 'none' mode in MTA-STS?
Does MTA-STS prevent eavesdropping on email traffic?
What is the purpose of the MTA-STS policy 'id' value?
Does MTA-STS validate the MX records of a domain?
What is the recommended 'max_age' for an MTA-STS policy?
Does MTA-STS require a dedicated server for its policy file?
What is the content-type for an MTA-STS policy file?
Does MTA-STS provide authentication for the email itself?
What is the sequence of steps for an MTA to retrieve an MTA-STS policy?
Does MTA-STS protect against certificate authority compromise?
What is the format of the MTA-STS policy file?
Does MTA-STS rely on a specific DNS record name for discovery?
What is the 'v' tag in an MTA-STS policy TXT record?
Does MTA-STS work with starttls?
What is the purpose of the MTA-STS 'mx' rule?
Does MTA-STS ensure that all mail is encrypted?
What is the default port for the MTA-STS policy lookup?
Does MTA-STS affect DNS records for email?
What happens if an MTA-STS policy file is not found?
What is the purpose of the MTA-STS 'version' tag in the policy file?
Does MTA-STS replace the need for DMARC?
What is the minimum recommended 'max_age' for an MTA-STS policy?
Does MTA-STS protect against passive monitoring?
What is the common error when the 'id' in the TXT record does not match the policy file?
Does MTA-STS secure the entire email path?
What is the purpose of the MTA-STS TXT record?
Does MTA-STS allow for wildcard MX entries?
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