Re: Trivial change in Public Cert behaviour coming soon

["John R. Levine via NANOG" <nanog () lists nanog org>]

On Fri, 23 May 2025, Jay Acuna wrote:
> Using a client TLS cert with SMTP is an option within the TLS
> protocol, and some clients do.

No, that was a misreading of a decades old file in the sendmail distro.

As anyone who rus a mail server knows, in fact SMTP clients do not send 
certificates (not to be confused with submission, which is not SMTP, where 
a few systems do use privately signed client certs.)

I really wish this zombie argument would die.  The people who run mail 
systems are not all stupid, and if client certs were useful, someone in 
the past 30 years would have tried using them.

R's,
John
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