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How to set up emailing in a MixUp software?

If your videos are still not sending, then you need to turn on two-factor authentication in Gmail settings and to create a password for app.
Then enter this app password instead of the password that you've used before.

Settings for Gmail:
Port: 465
Connection Security: SSLTLS
Authentication Method: Normal Password

If you still see SSL error, then try using the other email. It may happen that your email was blocked by Gmail for a day or two.

Please press "Retry" to check new settings.