How do I fix Outlook is suddenly not sending or receiving emails?

I'm not sure what Spectrum is. My email provider is Telstra/Bigpond, but I'm having exactly the same problems with receiving & sending emails with new Outlook as others have described. I can receive, but not send, emails if I revert to old Outlook. Thankfully, I can also receive emails on my iphone.

I have tried re-installing Microsoft 365 & have spent hours trying to sort this out, but nothing seems to work & I'm getting a bit chuffed off about it. Why is there no fix? Why are we paying Microsoft?

It says a lot about Microsoft when we look to fellow users to try & fix issues. I am the first to admit I'm not very bright about technology: I gained my medical degree before the advent of widespread computer use.

I just want to be able to send & receive emails...

I talked this morning (2/12/25) with Spectrum about this email issue. My Outlook stopped charter.net email for me on 1/31 and today it's now not working for my husband. It's not on Spectrum's side at all. It is something inside of this new Outlook that overtook Mail for Windows, which we really liked. The new outlook, not so much!

I have the same problem. Just started today on my desktop computer using New Outlook. I'm running Windows 10. My serivce provider is Fidium. My email is working just fine in my gmail account on my desktop and on my cell phone. I've gone round and round in circles trying Microsoft help. This is really fustrating. I'm thinking it's a problem with Outlook and Microsoft. Too many variables in this post with the only commonality being Outlook.

I've not been able to send or receive emails since Friday 7th February. I've spent hours trying to sort it with no luck. Most of the help is of no help whatsoever. Microsoft on-line help indicated that if I purchased the Microsoft 365, I could chat with an advisor....! I recently had to reinstall Microsoft Office, so maybe that is part of the problem...someone on here had installed Microsoft 365 and couldn't then send or receive emails until the Microsoft support person moved him to the old version of Outlook and he was able to get Outlook working again. As I already have Microsoft Office, I don't really want to pay £84.99 for Microsoft 365. I will keep trying...

I have tried all that even reloaded an updated email app and it has taken over eight hours and still not uploaded my emails