When attempting to send email through AccountEdge Windows, some customers have reported receiving the message:

Below is a link to a site that gives information on that error. We are sharing this information in the spirit of being up-front, although we cannot condone, encourage or support its use.

http://www.exchangeinbox.com/article.aspx?i=57

https://support.office.com/en-US/article/HA001229943