Am 08.07.2022 15:49 schrieb Dave Voutila:
$ openssl s_client -showcerts -servername mail.thinkerwim.org -connect mail.thinkerwim.org:587
`-starttls smtp` helps a lot. The cert is there (also on :25 ftm) and signed by LE.
The rub is that the mutt client machine does not know that issuer, See openssl documentation how to do this. HTH -- pb