Everyone seems to be getting email I send out except for one person. They've always received my emails for years and to my knowledge nothing has changed recently. Now when I send her an email, I get this postmaster undelievered message: "Your message wasn't delivered. Despite repeated attempts to deliver your message, a connection to the remote server couldn't be made. Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that your email system is unable to connecto their email system. Give them the error details shown below. It's likely that the recipient's email admin is the only one who can fix this problem. For more information and tips to fix this issue see this article: Fix email delivery issues for error code 4.4.7 in Office 365." It appears the problem is at their end, since my other recipients get emails from me. Any idea how to fix this? We use Charter and their email is on Comcast.