How to verify that SSL for IMAP/POP3/SMTP works and correct certificate is installed?

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First of all, connect to the server using SSH.

To verify if proper SSL is installed please use the following commands:

STEP: 1
IMAP via SSL
 uses 993 port by default:

  1. a. connect to mail server using openssl :

    b. Check output and make sure that valid certificate is shown:

     

    c. Make sure that you received IMAP server response:

     


    STEP 2:

    POP3 via SSL uses 995 port by default:

    a. connect to mail server using openssl :

     

    b. Check output and make sure that valid certificate is shown:

     

    c. Make sure that you received POP3 server response:

     

     

    STEP 3:
    SMTP via SSL uses 465 port by default:

    a. connect to mail server using openssl :

     

    b. Check output and make sure that valid certificate is shown:

     

    c. Make sure that you received SMTP server response:

     

thats it.

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