encryption issue in outlook 2016

[Joseph Tam]

On Fri, 14 Sep 2018, ChandranManikandan wrote:

> I don't purchase anything.
> It's installed in the server when install qmailtoaster.

That's the problem -- a stranger has no assurance that the certificate
you're presenting actually belongs to your server or someone pretending
to be you.  Hence the mail reader warning.

> Please suggest the procedure.

You got 3 options:

 	1) Create your own self-signed certificate and have your
 	users import it.  This may work with small installations
 	where trust is a phone call away.

 	2) Install a ACME Certbot to install a Let'sEncrypt
 	certificate that gets renewed every few months.

 	3) Purchase a certificate from a recognized CA (sich as
 	Verisign/Thawte/whoever) and install that.

If you got a few bucks to spend and lacking in technical expertise,
3 is your best option.  Instructions?

 	http://lmgtfy.com/?q=Obtaining+a+CA+signed+certificate

Joseph Tam <jtam.home at gmail.com>