Email stuck in Outlook.com

If your emails are not sending from Outlook.com, check these things first:

Check to see if the stuck email is in your Drafts or Outbox folder.
If the message has an attachment that’s larger than 25MB, delete the attachment and either attach a smaller file or upload the file to OneDrive and then attach a link to the attachment. You can then try to send the message again.
If your Inbox is full, you won't be able to send or receive new messages. To make room in your inbox, try emptying your junk folder by right-clicking Junk Email and then selecting the Empty folder.
If you're using Outlook on PC or Mac to send your Outlook.com account email, go to Send/Receive > Send/Receive all folders.

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