Reporting mechanism for failing emails.
https://tools.ietf.org/html/rfc8460
Frameworks
Get access to data on 51,490 websites that are SMTP TLS Reporting Customers. We know of 1,403 live websites using SMTP TLS Reporting and an additional 50,087 sites that used SMTP TLS Reporting historically and 543 websites in the United States.
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Get a list of 51,490 websites using SMTP TLS Reporting which includes location information, hosting data, contact details, 1,403 currently live websites and an additional 3,918 domains that redirect to sites in this list. 50,087 sites that used this technology previouslyand 543 websites in the United States currently using SMTP TLS Reporting.
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