The phone does not have a browser, but an email client. He does not see the certificate.
Outlook on the computer also does not see the certificate.
Browser - ok

    aaP_randreevich
    Then check the SSL of the mail server. The SSL of the website is not the same as the SSL of the mail server.

    aaP_randreevich
    Check the app store to see if it is installed. If not installed. It is recommended that you consult the relevant person in charge

    aaP_randreevich
    What do you mean by client? What is a cell phone? Under what circumstances can I not view the certificate?
    Outlook is the client of the mail server. Are you using the mail server on our panel? Check in the app store to see if it's installed
    If not installed. It is recommended that you consult the relevant person in charge

    2 years later