TLS-RPT
Reports about TLS delivery failures between mail servers.
SMTP TLS Reporting lets domains receive aggregate reports when senders fail to deliver mail over TLS. It is commonly paired with MTA-STS so domain owners can see whether strict transport policies are causing failures.
reading this as developers picking email infrastructure
The question here is which one a backend engineer would rather operate. That means SDK depth in the language already in use, whether a retry can safely be replayed, how much the event log tells you when a customer says the email never arrived, and whether the pricing curve stays sane as volume grows.
Applied to tls-rpt, that means weighing developer experience, SDK breadth, idempotency keys, and operating track record ahead of the rest, against password resets, receipts, and magic links shipped from application code.