Nothing is deleted. Your settings and your log stay where they are, so reinstalling puts you back where you were.
If you want them gone, turn on Delete the settings and the log when the plugin is deleted under Settings → When uninstalling before you delete it. Deactivating never deletes anything either way.
Still stuck? Ask the developers who wrote it. We aim to reply within one business day.
![The Send a test screen of Email Delivery in WordPress admin. A red box reads It did not go. SMTP Error: Could not authenticate. Below, a panel headed What the mail server said, noting it is safe to paste into a support request, shows the full conversation with smtp.sendgrid.net, the sign-in lines replaced by [credentials hidden], ending in 535 Authentication failed: The provided authorization grant is invalid, expired, or revoked.](https://www.traslatability.com/wp-content/themes/traslatability/assets/screens/email-delivery-by-traslatability/crops/01-test-transcript-m.webp?ver=1792726162)