Sender's email address

List of recipient email addresses separated by ";" or ","

List of cc recipient email addresses separated by ";" or ","

List of Bcc recipient email addresses separated by ";" or ","

Email subject

TimeZoneOffset. Timezoneoffset should be specified in format ±hh:mm

Body of the email

This is a list of attachment ids. When attachments are uploaded through api/Upload , a string id is returned on successful file upload.
Include these ids for the email attachment(s).This property should be ignored if there are no attachments.
If the cumulative size of attachments exceeeds 100 MB , attachments will be available for download separately via a secured website.

This is a dictionary (key , value pair) .This property should be ignored if no specific mail headers need to be included.
Here is an example of Options - {"X-RPost-Sidenote-Text" : "Side note example", "X-RPost-Sidenote-Cc" : 1 }

If large mail is set to true , the email attachments will available for download separately and not attached to the email.The email will contain a link to download the attachments.
By default it is set to false.