osecb.blogg.se - Outlook emails stuck in outbox 2016

Using a program that accesses pst or ost data, such as Desktop Search, Lync, etc.

Wrong password or not authenticating properly with the mail server.

An add-in that marks items read if you view the Outbox.

If the message is not too large to send, other possible causes include:

It's most likely a read receipt that won't send. If you don't see a message in your outbox but Outlook is trying to send something, see Hidden Stuck Messages. If you are using a Comcast account and messages aren't sending, you need to change your outgoing server to use port 587 or 465 and set Use this following type of encrypted connection to None then click OK.