Certificates Showing As Expired on some platforms

[Osiris]

@tenjin

ssl_cert = </etc/letsencrypt/live/tenjinconsulting.co.uk/cert.pem

Change cert.pem to fullchain.pem and reload Dovecot.

Is there also a SMTP service running somewhere? Ah yes, SMTP with STARTTLS on port 25 also misses the intermediate certificate. Please also update and reload your SMTP service.