I moved my PC to a new home and found that my Outlook can receive but not send when connected to the home's wifi. When I set up a hotspot on my phone the problem was solved. I found the same thing when I was traveling with my PC: at some hotels/friend's houses it would work, and at others not.
Really appreciate any help.
Outlook not sending emails over wifi
Email not sending over wifi - Best answers
Outlook not sending emails on hotspot - Best answers