As a matter of principle, evenito has no influence on the spam quality of emails.
However, there are a few tricks that you can follow, to ensure that messages reach their destination more effectively. It helps, for example, if you write out the links in the e-mails in full with https at the beginning and that all links work, i.e. no so-called "dead links" that lead to outdated websites or into the void.
To test the quality of the emails, there is this useful Tool: https://www.mail-tester.com. Here you can send your test email to the address given on the homepage. After about 30 seconds, click on the "Test" button. Then the email will be analysed and you will see what you could do better in the email.
It may also happen that when you send (test) emails to your own address, the messages are blocked by a filter of your organisation and therefore do not arrive in your inbox. In this case you do best to test the sending on a private email address. If this works, you can ask your IT department if they have set up a special filter.