The certificate for this server is invalid

Hi,

Our organization is using Exchange Server 2010 and mail clients include Windows Outlook, Mac mail, iPhone, iPad and Android mobile. A Mac Mail user report that he cannot receive emails and error message appear on his screen:

Mail can't verify the identity of the server "mail.lorsorsors.com".

The certificate for this server is invalid. You might be connecting to a server that is
pretending to be "mail.lorsorsors.com" which could put your confidential information at
risk.

He tried to delete all "mail.lorsorsors.com" certificates in keychain on his iMac but the same error still comes up. The other users are working normally.

Can anyone help?
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DT1640759System Engineer - ITAsked:
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Tom CieslikIT EngineerCommented:
If the name of this domain is real I try to check domain records and it says "Non-Existent domain"

Make sure you have DNS record for this domain and is not expired.

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DT1640759System Engineer - ITAuthor Commented:
Hi Tom,

Thanks for your reply. I changed the domain name before I post. All DNS and MX record is correct and is not expired.

This issue only happen on one iMac Mail. The user use other iPhone and iPad without this issue. I think the problem is on his iMac.
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Tom CieslikIT EngineerCommented:
I found article in internet about mail software on Mac.
It looks like this is very typical error

When Mac Mail connects to your server, it by default attempts to connect using a SSL connection. On shared servers, the SSL certificate will look similar to secure108.inmotionhosting.com. Mac mail is throwing an error because it is not seeing a SSL certificate for "mail.example.com", and instead it is seeing the secure108.inmotionhosting.com certificate. This is common, and it is safe to ignore. Click "Connect" to ignore this message and continue. To verify it is an inmotionhosting.com certificate, click "Show Certificate", and you should see it listed.

Try ignore this error and then after connection double check if certificate is valid

https://www.inmotionhosting.com/support/email/mac-mail/mail-cant-verify-the-identity-of
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DT1640759System Engineer - ITAuthor Commented:
Hi Tom,

I have read this article before. My error message is :

Mail can't verify the identity of the server "mail.lorsorsors.com".

The certificate for this server is invalid. You might be connecting to a server that is
pretending to be "mail.lorsorsors.com" which could put your confidential information at
risk.

There is no any "Show Certificate" or "Do you want to connect to the server anyway?". System only has "OK" button.
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Tom CieslikIT EngineerCommented:
Can you connect to mail server on iMac using OWA ?
What certificate you see ? the real one ?
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DT1640759System Engineer - ITAuthor Commented:
Hi Tom,

I need to ask the user tomorrow. I will update you.
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DT1640759System Engineer - ITAuthor Commented:
Hi Tom,

Issue have been solved. User delete all company certificates in keychain (include root certificate). Email return normal. Thanks.

Case close.
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DT1640759System Engineer - ITAuthor Commented:
Issue have been solved by user.
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