@pratschavan  Based on the exception shared it is telling you that the ingested msg files you have do not follow RFC-2822 specification the extractEmailHeader controller service has a requirement. States that the particular MSG it tried to process was missing the sender. You may need to write your won customer reader for your formatted MSG files and without, unfortunately I will not be very helpful as it is outside my area of knowledge. If you found any of the suggestions/solutions provided helped you with your issue, please take a moment to login and click "Accept as Solution" on one or more of them that helped. Thank you, Matt ... View more