Running Win7 and with newest update messages are not sending. Did full diagnostic with all items OK. Logged into Outlook on mobile and Internet to try to send. Didn’t happen. I have eM Client minimized because there is an unsent message in Outbox. All ports are working along with a special rule on Firewall allowing full access for eM. If what you call the Outbox is Sent nothing appears although I see no such thing as Outbox. Never had this problem with eM Ver. 6.x. I am using eM for personal use only and I thank you for offering it. Here is the original message was getting before doing the diagnostic. No message appears at this point although the email does not send.
I solved this problem. Others using MSN/Outlook could be facing a similar difficulty. MS switched my primary email (was MSN) to Outlook and placed my MSN as an alias. Once I made the change in eM Client sending and receiving began to work fine. MS will constantly change eM Client to non-default email program. It does not cause any problems.