Kerio connect emails sent as spam

i have Kerio connect 8 configured OK sent and received but when user sent mails to outside receivers thay found it on spam folder why

also when user trying to access there mails via webpage using Google chrome or Firefox https error found

Your connection is not private

Attackers might be trying to steal your information from Server (for example, passwords, messages, or credit cards). NET::ERR_CERT_AUTHORITY_INVALID
Back to safetyHide advanced
This server could not prove that it is server; its security certificate is not trusted by your computer's operating system. This may be caused by a misconfiguration or an attacker intercepting your connection.

Proceed to server (unsafe)
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BudDurlandDirector of ITCommented:
The second issue is likely because you are using a self-signed SSL certificate for the web mail server.   See for instructions and guidance.  Small shops usually just import the self-signed certificate to the client machines, larger organizations may opt for purchasing a commercial ticket.

As for why e-mails are landing in the recipient's spam folder, there are many reasons why their mail server could have considered your message as spam.  You will need to coordinate with the admin of that mail server to find out, or at the very least, ask them to whitelist your domain.  Some things to look at on your end:

make sure your IP address is not in a range considered "dynamic"
Create an SPF record for your domain
Make sure there is reverse DNS set up for your server's external IP address, and that the host name is the same as the one used by Kerio in the SMTP greeting.

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MASWORLDAuthor Commented:
the link not working
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