t/s expired cert error

Matthias Kneer
Tue, 02 Mar 2021 20:02:10 -0000

> # echo | openssl s_client -connect emu.sbt.net.au:110 2>/dev/null |
> openssl x509 -noout
>  -enddate
> unable to load certificate
> 139830305752976:error:0906D06C:PEM routines:PEM_read_bio:no start
> line:pem_lib.c:707:Expecting: TRUSTED CERTIFICATE
>

Your test does not use starttls on port 110, could you retry like this?:
echo | openssl s_client -connect emu.sbt.net.au:110 -starttls pop3
2>/dev/null | openssl x509 -noout -enddate

Is the clients time / date properly configured? For me all your
pop3s/imaps/smtps ports answer fine.