The TCP/IP connection was unexpectedly terminated by the server. (Account:'pop.mindpring.com',SMTP Server:'smtpauth.earthlink.net', Error Number: 0x800ccc0f).
I was able to do this successfully in the past and cannot think of anything that we have installed on the computer since then. The emails I am replying to are from people who are in my Outlook address book.
The Outgoing mail server requires authentication is checked in the account properties.
I greatly appreciate any advice,