We are using pb2019 R3. Also, we are using using Rolands smtp code. they both work fine.
But since this summer we are getting, sometimes, this error when sending emails.
Command failed: 421 4.7.66 TLS 1.0 and 1.1 are not supported.
Pease upgrade/update your client to support TLS 1.2 Visit........
I have seen in a microsoft page, that the server, gradually, would send back this message aleatory, for those request that are using 1.0 and 1.1, for warning.
In internet options I have unchecked "use TLS 1.0 and 1.1" and keep checked "use TLS 1.2"
Since we won't send a mass mailing until next month, we can't proof it.
The question is, is there someting to do in PB for this to work or it's just a OS problem? Do you have this problem? how did you solve this?
In any case, next month I will tell you if the solution proposed (unchecked "use TLS 1.0 and 1.1" ) works.
See the images bellow for error and configuration of TLS
Thanks in advance.
Juan Pedro Sanz Díez