Outlook for Mac Error code -1001

Question

A user reported that he's been seeing this issue for "some time" where when he sends out an email with attachment (less than 5 MB), he receives this error: "An operation on the server timed out. The server may be down, overloaded, or there may be too much net traffic. I couldn't find a clear solution from Microsoft or Apple forums.

Can you tell me how to fix this problem?

Answer 1

Dear Jeff KL To,

Thanks for your feedbback!

Sorry not to help you, in view of your feedback, your appeal is beyond my technical support scope, in order to better help you, do not waste more time of your time, I would still like to recommend you here for help, there will be a special manager in charge of Outlook for Mac engineers to continue to help you. Please kindly connect to in-app support.

Your cooperation and understanding will be highly appreciated! Sincerely hope that your problem will be solved soon!

Wish you have a wonderful day and always stay safe!

Best regards,

Kerry

Answer 2

Thank you for your help, I already to readd AC，but same problem

Answer 3

Dear Jeff KL To,

Thanks for choosing Microsoft community!

At first please kindly try to login OWA(outlook web app) to check the result.

I suggest firstly check your outgoing server (SMTP) configuration. If there are no problems with your account settings, you will see a green dot before your account when you going to Tools > Accounts.

If there is an yellow dot next to your account, then here is a reference article for you to Re-add your email account to Outlook to see if it helps.

Moreover, to get further suggestions and better help you with this issue, I'd like to recommend the dedicated Outlook in-app support team to you, you can simply contact them in Outlook client by simply going to Help > Contact Help to require further 1:1 troubleshooting.

Hope this can help you and wish you all the best!

Best regards,

Kerry