I created mail send flow for quotation form .
but email can not send to user why .
Hi, welcome to the community! 
Would love to help you out, but unfortunately, I don’t think I’ve got enough context to provide a great response here.
If you’re having trouble sending emails, I’d make sure that you’ve got your email configuration set up correctly first.
Here’s the documentation on how to do that:
Feel free to share more details about what specific issue you’re running into and I’ll be happy to help troubleshoot further!