Cant send invoices by email

Just back of holiday today & updated to the latest manager version. Just done my first invoice of the day & cant email to my customer. Getting the below error message. Any advice welcome.
Thanks

An error occurred while attempting to establish an SSL or TLS connection. The server’s SSL certificate could not be validated for the following reasons: • The server certificate has the following errors: • The revocation function was unable to check revocation for the certificate.

Always search the forum first. You would have found posts like this E-Mail errors after update - #10 by eko

They dont seem to have solved it either. I removed my avast anti virus, which isnt the best idea but was recommended on that other thread, & its amended the error messgage now to

The SMTP server has unexpectedly disconnected.

Please show a screensot of the Manager version and of your smtp settings.