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    MailKit is cross-platform .NET library for IMAP, POP3, and SMTP.

    The main reason for using the MailKit library is a wider range of supported protocols, certificates and improved speed.

    MailKit is used by SuperOffice Netserver, e.g. Inbox in the Sales client.

    MailKit is enabled for CRM Online from version 8.0 (R23), and can be enabled manually on Onsite from version SuperOffice 8.0 SR3.

    Current version of MailKit is:

    How to enable MailKit


    (On by default - cannot be disabled/enabled)


    (On by default on 8.1)

    1. Open the web.config file for your site
    2. Replace the value for Mail Reader and Sender to "MailKit".
    3. Save the file web.config file
    4. Recycle the application pool


    How to troubleshoot MailKit

    Connection and authentication


    The better and more modern way is to use port 587 on outgoing mail. It starts of unencrypted, but the connection is upgraded to encrypted (using STARTTLS) if the server supports it. Connections to 587 should not have the SSL checkbox, as it starts off without encryption (and that checkbox will enforce encryption from the beginning of the connection).

    If your server support to use port 587 on outgoing mail, using that port is much better than 465:
    The normal behaviour when connection to port 465 (outgoing), is that the connection is wrapped in a secure connection. If you can telnet to that port, and get the result back in clear-text, ie. it is not encrypted. To troubleshoot SSL/encrypted connections, use Putty.
    MailKit expects connections to port 465 to be encrypted. 


    Incoming: (Yet to be completed, please use "feedback" button to submit your experiences)



    Submit a support request to your local support team. They can get in contact with our Online Operations team to activate the debug logging for email.


    Read section "Mail logging" here