If you just want to create a link, and your users all use Windows, you can use the URL protocol association, which is installed to take notes: // URLs open the Notes client.
To get the URL, go to the email and click File> Document Properties. Go to <+>, and then copy the Notes URL specified in the Identifier section.
I believe this feature appeared in version 6 and is enabled by default for all Notes clients after that on Windows.
If this does not work for you, the next best way is to create fields in your web application where people can copy the body of the message, sender, recipients, etc.
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