I did a search on this forum and tried several of the suggestions but non appeared to work. Some email providers (such as your ISP or even Gmail) won't let you send messages larger than a certain size. Adding pictures and large attachments to your message can prevent you from sending that message (and any messages sent Fix Outlook and Office365 Sync Issues after the large message). If you’re using cPanel, Outlook is most likely setup with POP3 account or IMAP. I’ve seen some providers have issues when auto Send/Receive is set to less than 5mins. Outlook accounts can have up to 100GB of storage per mailbox.

Repair your classic Outlook program

And in most cases, that’s where it belongs. For more information on creating a new email profile, see Create an Outlook profile. Please go to Reset a forgotten Microsoft account password for troubleshoot Outlook synchronizing folders error more information.

Make sure you are connected to the Internet

But every once in a while, the Microsoft filters get it wrong and accidentally label a normal email as spam. To start Outlook in safe mode, press the Windows key on your keyboard. In the search box, type outlook.exe /safe, then press Enter.

Check your blocked users list

If you've changed your password on the website for your email account, you'll need to change it in new Outlook, too. Sign up for tips and industry insights to level up your emailing skills. Outlook lets you block a sender or a domain in just a few clicks. This is a great way to protect your inbox from spammers and cyberbullies. If an email triggers the spam filters, Microsoft automatically moves it to your junk folder.

Create a new Profile

But if you’ve never cleaned your inbox, then you might have maxed out your storage limit. So if you’re waiting for an email from someone, you may want to check if the sender is registered on your blocked users list. But still, it’s worth checking if other users are currently experiencing similar issues with Outlook. Microsoft comes with a great option called Work Offline.

• Once enabled, this setting lets you disconnect from the server.
• It includes a listing of your accounts, autocomplete information, and your name and initials.
• Go to your Outbox and then open the stuck email messages.
• This is a great way to protect your inbox from spammers and cyberbullies.
• To disable all add-ins, you can start Outlook in safe mode.
• Fortunately, you can change how your messages get organized.

For more information, visit Add an email Exchange connectivity diagnostic account to Outlook for Windows. If that doesn't fix the problem, see the next section. To get help and troubleshoot other Microsoft products and services, enter your problem here.