Authentication Problem with Sending Email in Office365 using SMTP

If SMTP authentication (using login/password) fails for your account, then it may be that your account is configured to require MFA (multi-factor authentication).   You may need to change settings to allow for legacy authentication (single-factor auth).   See Also, an app password may be required.  See    

Convert CkDateTime to Delphi TDateTime

Question: Which is the best way to convert a CkDateTime to a Delphi TDateTime? Answer: I didn’t know the answer, so I Googled “Delphi TDateTime” to see exactly what it is.  It brought me to this web page: In Delphi, TDateTime is a type that maps to a Double. In C++, the TDateTime class corresponds to the Delphi TDateTime […]

0x80090016 – Keyset does not exist

This blog post describes one possible cause for the “Keyset does not exist” error when trying to access/use a non-exportable private key via the Microsoft CNG or CryptoAPI. The situation was that the certificate was installed to the user’s Current User Personal Store, but the corresponding private key was stored in the Local Machine Key Store (machine keyset).  There were […]

OAuth2 Request Access Token w/ Basic Authentication

Some OAuth2 token endpoints want the Client ID/Client Secret to be included using HTTP Basic Authentication. For example, we can look at the documentation for the GoToMeeting API at You’ll see this under the “2 – Request Access Token”  in the GoTo API documentation linked above: curl -X POST “” \ -H “Authorization: Basic {Base64 Encoded consumerKey and consumerSecret}” […]