On Sat, 18 Nov 2023, Joe wrote:
If this area is likely to be the issue, try telnet to the IMAP server using port 143, you should get back a list of capabilities which may help. Oddly, though I'm using port 993 to my local server, it does not return any information from that port, only on 143. Presumably this is to assist security.
I'd assume you need to use something like openssl s_client rather than telnet to port 993.