Enable STARTTLS option - Intermediate Certificate missing

[andreafa]

I've configured the environment variables:
INBUCKET_SMTP_TLSENABLED, INBUCKET_SMTP_TLSPRIVKEY, INBUCKET_SMTP_TLSCERT

After testing the receipt with https://www.checktls.com/TestReceiver, I got:
TLS OK - Cert FAIL

The connection log provided by checktls.com says:
Certificate #1 of 1 (sent by MX):
Cert VALIDATION ERROR(S): unable to get local issuer certificate
This may help: What Is An Intermediate Certificate
So email is encrypted but the recipient domain is not verified

The workaround is to add the intermediate certificate within the INBUCKET_SMTP_TLSCERT file
!! AFTER the domain cert, otherwise it does not work !!
result: TLS OK - Cert OK

Maybe you could add a new environment variable for the intermediate certificate,
something like: INBUCKET_SMTP_TLSCERTCHAIN