Citeren Voytek Eymont <voytek@sbt.net.au>:

On Wed, March 3, 2021 1:17 am, Yassine Chaouche wrote:
hmm, just tried this, 110/143 gives error, 995/993 doesn't:

I'll try changing in TB to SSL/TLS not StartTLS, 995 or 993, etc, and, see
if error goes

# echo | openssl s_client -connect emu.sbt.net.au:110 2>/dev/null |
openssl x509 -noout
 -enddate

On port 110/143 you need to tell the POP3/IMAP server to upgrade the connection to TLS. In that case, it will work just fine:

# echo | openssl s_client -connect emu.sbt.net.au:110 -starttls pop3 2>/dev/null | openssl x509 -noout -enddate
notAfter=Apr 27 12:11:32 2021 GMT

#echo | openssl s_client -connect emu.sbt.net.au:143 -starttls imap 2>/dev/null | openssl x509 -noout -enddate
notAfter=Apr 27 12:11:32 2021 GMT

Remember that there is a difference between connections that are upgraded to TLS (110/143) and connections that use SSL by default (995/993). If you don't tell the first that you want to use TLS, the server will not present the certificate, unlike the latter.

Regards, Arjen