Drupal 8.x

I have created a Webform in Drupal 8. (www.seniorama.one > OVER ONS > LID WORDEN). When I complete the list, an e-mail should be sent but it doesn't happen. Have a look at the two links:

https://ibb.co/pWJkRqb

https://ibb.co/t4GY9tw

What can I do? I get this error and receive no e-mail in my box.

I am very new to Drupal. I have a running website on Red Hat Linux. I followed the following steps to upgrade to 8.9.9 https://www.drupal.org/docs/updating-drupal/updating-drupal-core-manually. In short I have done,

Select all the files in the top-level directory (also hidden files starting with a dot) as well as the 'core' and 'vendor' directories, and delete them. Be sure not to delete the 'modules', 'profiles', 'sites', and 'themes' directories.

I have a content type that has a title, body, an auto-incremented field for account numbers. Every time a user needs an account number they fill in the blanks an it will display the information to them. I have created a view that has a table with the information including the week number it was created on. I am having problems filtering out the entries that were only created during the current week or current month. In other words if the content was created in the week (48) of the year and it is still week (48).

First, I have been researching this for 4 days and have tried every possible solution I have found on the internet
Trying to create a new Drupal project running composer create-project drupal/recommended-project folder --no-install -vvv

It fails with a 404 when downloading the recommended-project.json file. This is the URL being sent for that file:

https://packages.drupal.org/files/packages/8/p2/drupal/recommended-project.json