I’m really having a hard time trying to find the purpose of your post. Given the post you quoted mentions nothing about checking gmail spam, which is mentioned in a later post.

However, we have a user that hasn’t received an important email from avast that he states would be sent to his gmail address.

Since all gmail is checked for spam there is every possibility it could have been incorrectly considered spam and filtered, so it is very valid that the OP checks.