SENDHTML Doesn't Recognize @CLIP:

SENDHTML command - Send an HTML-formatted email message
You can use the same approach to send the text content of the clipboard (@CLIP:) or the console (@CON:):

sendhtml abc@xyz.com Party @c:\messages\invitation.txt
sendhtml abc@xyz.com Party @clip:
type myfile.txt | sendmail abc@xyz.com Party @con:

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