Dear Team,

I am using Utilities: Email Parse function in the workflow, in the post processing I have to extract the x-env-sender header value and need to add it as an artifact but it gives me the error below.

Below is my script line, I am just extracting the value of different headers, it works fine if the header name doesn't contain "-"

e.g 
from_addr = results.headers.from 
it will work perfectly fine

But if the header contains "-" in the name it always gives an error 
Orig_Sender = results.headers.x-env-sender

Below is the error. 
============Error============= 
An error occurred while processing the action acknowledgement. Additional information: Post-processing script for Function 'Utilities: Email Parse' from Workflow 'Email Attachment Analysis' was unable to complete because: mismatched input ''x-env-sender'' expecting set null


POST script
============

import re
# The output includes:
# - headers, a dictionary of all the headers
# - subject
# - body_text and body_html (depending on how the email was formatted)
# - an array of attachments
# - timestamp

subj = results.subject
all_from = ", ".join(f.email for f in results.from)
all_to = ", ".join(f.email for f in results.to)
orig_date = results.headers.date
email_date = results.datetime
reply_to_add = "Reply-To: (.*)\n"
headr = results.headers


send_domain = all_from.split('@')[1]


Orig_Sender = results.headers.x-env-sender

# Write a note with the email body
if results.body_html is not None:
# richtext body
content = u"<div><p>Subject: {}<br>From: {}<br>To: {}</p>{}</div>".format(subj, all_from, all_to, results.body_html)
note = helper.createRichText(content)
incident.addNote(note)
else:
# Plaintext body
content = u"Subject: {}\nFrom: {}\nTo: {}\n{}".format(subj, all_from, all_to, Orig_Sender)
note = helper.createPlainText(content)
incident.addNote(note)


incident.addArtifact("email_time", orig_date, "Email Time")
incident.addArtifact("actual_sender", all_from, "Sender of the Suspecious Email")
incident.addArtifact("actual_reciver", all_to, "Actual Reply to")
incident.addArtifact("attached_mail_subject", subj, "Attached Email Subject")
incident.addArtifact("sender_domain", send_domain, "Malacious Email Sender Domain")