Authentication Error: The problem can also be caused if the authentication or security settings (or SSL/TSL certifications) have been expired or are wrongly configured.Ĥ. Therefore, if your email has crossed the limit, then Outlook won’t be able to send it.ģ. Large Email Attachment: By default, Outlook has a limit of 20 MB for the size of any email attachment. Wrong Configuration: If your Outlook account has not been configured properly or you have entered the wrong IMAP/POP/SMTP details, then it can cause this issue.Ģ. Before we diagnose the problem, let’s have a look at some of its leading causes:ġ. Ideally, there could be all kinds of Outlook Express mail sending problems causing this issue. Many factors contribute to your outlook not sending emails from the outbox. You might see queries like 'error messages' after you attempt to send a message. When messages get trapped in outlook, the messages take a lot of time during sending and might eventually return unsent. So you probably are not the only one reading this article and it likes presently.
Why Do Emails Go To Outbox But Not Sending?įor many outlook users mail not sending and getting jammed in the outbox is a very common thing.
