Your emails are recognized as spam. Try changing the subject and text of the email, or change your account.
Another option is to write to the technical support of your mail service with an explanation of what you are doing and why with their mail.
Mail.ru and Yandex can respond within a few days. Gmail can take a very long time to respond.
Sample text of the message:
“Good afternoon, I have a program that sends guests a link to a video from google drive.
> Usually 50-100 emails are sent per evening.
> And often comes up with this error.»
Answer:
“Sorry for the inconvenience. Fixed the problem — please check now.
Sincerely, Robert B.
Customer Support Service»