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 repair PST file without data loss 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

It includes a listing of your accounts, autocomplete information, and your name and initials. To repair your Outlook profile or create a new one, see Fix your Outlook email connection by repairing your profile. Go to your Outbox and then open the stuck email messages. If that message has an attachment that's larger than 20MB, delete the attachment and either attach a smaller file FixTechGuide login issue guide or attach a link to the attachment. For more information, go to Reduce attachment size to send large files with Outlook or Exchange Online limits.

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

Articles, examples, tutorials, and inspiration from our emailing experts. Create your account and connect with a world of communities. Find solutions to common problems or get help from a support agent. Occasionally, the Outlook program may need to be repaired. Repairing is a simple process but may take as long as half an hour to complete. For more information, see Repair an Office application.

Create a new Profile

For more information, go to Reduce attachment size to send large files with Outlook. I deleted the Yahoo and Google accounts from Outlook and set it up again and that didn't fix anything. I uninstalled the New Outlook app and reinstalled it and that didn't fix anything. I am fairly sure it is something in my Microsoft account since all 4 of my Windows computers stopped working for the email at the same time. I have another Windows computer with a different Microsoft account and that is working fine.

• Articles, examples, tutorials, and inspiration from our emailing experts.
• If that message has an attachment that's larger than 20MB, delete the attachment and either attach a smaller file or attach a link to the attachment.
• Which means that you won’t be able to receive new messages.
• For more information on creating a new email profile, see Create an Outlook profile.
• If you can send email while Outlook is in safe mode, creating a new Outlook email profile should allow you to send email again.
• Some email providers (such as your ISP or even Gmail) won't let you send messages larger than a certain size.
• I have another Windows computer with a different Microsoft account and that is working fine.

For more information, visit Add an email Fix Outlook and Office 365 Errors 2025 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.