Web 2.0 / API 2.0
Xojo Version: 2021r3.1
Server: Linux Ubuntu 20.04
I have a SMTPSecureSocket where we set SMTPSocket.SSLConnectionType =
However, Microsoft Office 365 is rejecting a small number of connections that aren’t using TLS 1.2 as they phase out support for the older versions. On occasion, I get a send failure with the error message:
421 4.7.66 TLS 1.0 and 1.1 are not supported. Please upgrade/update your client to support TLS 1.2. Visit https://aka.ms/smtp_auth_tls.
I can’t reproduce it regularly, because Microsoft is only rejecting a small number of connections for now.
Has anyone else seen this?
Is there reason to believe Xojo SMTPSecureSocket is not using TLS 1.2 for some reason?
Is it limited to Linux deployment?