Send Outlook Mail Message Dynamic Value

Hi,

Can you try the following step?

strBody ="Hi,
Please find the attached file.

Regards
{0}"

Then

string.Format(strBody,varBotMAchineName)

This will replace {0} with content of varBotMAchineName.

OR Create HTML Content activity might help you.

https://docs.uipath.com/activities/docs/create-html-content

Regards,