Creates or updates an email. For updates, the email id must be set to an existing email id. For creation, the email id must be set to 0.
{
"name": "Test email",
"campaignId": 69,
"parentId": 0,
"status": "Active",
"emailId": 0,
"from": "test@example.com",
"previewUrl": null,
"replyTo": null,
"subject": "Test subj",
"preheader": null,
"body": "... html body of the email",
"css": null,
"components": null,
"plaintext": null
}