Specify TLS 1.2 and the imap server doesn't support it

Question

Thanks for the examples, if I specify tls1.2 (force) and the receiving mail server does not support it. Will it downgrade it to 1.1 or 1.0? Or just error out?

Answer 1

Exception will be thrown.

You can specify multiple protocols as SslProtocols is a flag:

client.SSLConfiguration.EnabledSslProtocols = SslProtocols.Tls12 
    | SslProtocols.Tls11;