Support for Email Server TLS encryption on Sentora?

[betatester3.0]

I generated a certificate with let's encrypt but I guess I'm missing  something.
When I do a check with www.checktls.com I see:

Code:

[001.123]        Connection converted to SSL
[001.127]        
Certificate 1 of 1 in chain:
serialNumber= 42:f5:37:78:04:97:4f:80:05:33:15:c0:00:8b:74:de:8b:e
subject= /CN=mail.domain.com
issuer= /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
[001.127]        Cert VALIDATION ERROR(S): unable to get local issuer certificate, certificate not trusted, unable to verify the first certificate
[001.127]        This may help: What Is An Intermediate Certificate
[001.127]        So email is encrypted but the recipient domain is not verified

I have that issue with the mail server and google. it is now compulsory to have a ssl/ttl connection for google to show/display the secure lock icon as well as the mail not being sent straight to spam into the gmail mailbox.

and stay away from port 25 that will give you that warning from google, and for whatever reason they seem to not deliver the emails to the gmail server. or you have set this up at home and your isp screwed there config.

for my Sentora test server which I run at home did that and I traced the error back to the ISP, they had to configure there mail client correctly.