No Problem at all.
Seems you are using an "self-signed" Cert.
You can buy cheap domain validated ssl certs by 59€ / year i mean to remember.
Then this message wont show up.
Or you Accept the Cert in the mailclient , then this message also is not shown. In thunderbird you can do this, dunno how to do in Outlook Express and Outlook.

marko




On Wed, 31 Aug 2011 16:34:08 +0300, "gaby" <g...@autoglobus2000.ro> wrote:
Hi
 I use postfix with TLS optiion.I create certificates in same mod as
postfix documentation.It is Ok,postfix is perfect functionaly
I import CA certificate from PEM format in DER format then was
installed in windows as trusted certificate.

When I send email with outlook,or outlook express,is received follow
error:
"The server you are connected to is using a security certificate that
could not be verified.
A certificate that can only be used as an end-entity is being used as
a CA or visa versa.
 Do you want to continue using this server?"
If click yes It function normaly.

What is problem with CA certificate?

Thanks


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