Trying to send/receive by "synchronising bin" prevents receiving or sending

“Synchronising Bin” usually means Outlook is trying to sync your mailbox’s Trash/Deleted Items folder and getting stuck. You shouldn’t need to restart the whole computer each time.

First, sign in to your email provider’s webmail and check whether you can send and receive there. Open the Bin/Trash folder too. If it contains a large backlog, recover anything you need before emptying it through webmail—emptying it may permanently delete those messages. Then fully close Outlook and reopen it. If Outlook stays running after you close its window, end Microsoft Outlook in Task Manager before reopening.

If webmail works but Outlook still gets stuck, and you’re using classic Outlook on Windows, test a new profile through Control Panel > Mail > Show Profiles > Add. Add your email account and choose Prompt for a profile to be used, so you can test without removing your existing setup.

If the new profile syncs normally, the old profile or its local sync data is likely the problem. Keep the old profile until you’ve checked for local-only folders, drafts, and unsent messages. If webmail also fails, focus on the provider’s service or mailbox storage limit rather than rebuilding Outlook.