How do i start a process from Email by assigning Receive message event by sending a mail to my process model UUID the process should start!
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Here is a good documentation for you - docs.appian.com/.../Receive_Message_Event.html
to achieve custom fields from an email. how can we write that in the email we are sending. I want to know the structure of email.
It's not clear what you're asking for here. Emails are inherently unstructured. If you're looking to extract data items frim the body of an email programmatically this will be a very fragile way of exchanging data from one system to another. Are you able to send the data to Appian via a WebAPI instead, where you can control exactly the structure?