I have a webmail email account (GMX) which I added to the Windows 10 Mail app. My inbox is working well, however, I am not able to send emails. They end up in the outbox without actually going out. The test emails that I tried to send have no attachments so it's not a file size issue. I also updated the mail app thru the Windows store and ran the Windows 10 app troubleshooter without success. Any suggestions on how to fix this?
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