Cannot receive emails in Outlook but can send them.

There is an issue I have with receiving emails in Outlook. The problem started at the end of November just passed to now. I notice that Outlook crashes a lot and might be the background problem. My service provider is Telstra and I have been struggling numerous times and spent hours trying to get someone who can deal with this issue without luck. I have emptied my files to ensure that there is no capacity problem. My email account also shows that there is a 3-week gap in receiving emails except for about 3 or 4 emails that have come through in all this time.

I have the same problem with my iPhone 15. This device can send emails but not receive them using Telstra as the provider. My SMS system works ok.

Has anyone else experienced this type of concern recently?