Re: [ietf-smtp] encouraging PRDR (was: How to encrypt SMTP?)

[Keith Moore <[e-mail]>]

On 10/27/19 3:58 PM, Дилян Палаузов wrote:

> If random 4xx on MAIL as penalty for not offering reasonable TLS will help make things better, will random mail
> segmentation as penalty for senders not supporting PRDR, convince anybody to implement PRDR?

I don't think they're going to be well-correlated, because the benefits 
from encrypting mail transport and the benefits from optimizing mail 
error reporting are different.   They benefit different parties, and the 
perceived importance of encryption is different than the perceived 
importance of optimizing mail error reporting.

I support the idea behind PRDR and am not aware of any drawbacks to 
implementing it.   In general my observation is that the earlier mail 
transmission errors are caught and reported, the more reliable the 
reporting is; and the overall reliability of email improves by improving 
error reporting.

Keith