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Constellation

Can't send emails - SGH-T399

I have a Samsung SGH-T399 that I am immensely happy with (particularly the size), despite its age. However, I'm now experiencing a major issue. I have five email accounts and can receive emails , but can't send. This includes a Gmail account I prefer to use with my email app. My Gmail through the Gmail app both sends and receives. What I've done so far is cleared cache and data in safe mode but the issue continues. I also removed the sim card and placed it in a back-up SGH-T399 I have and the issue continues. I can't remove the app because it's one of Samsung's (or Android's) factory embedded apps.

 

Help will be highly appreciated.