The emails with "No Sender" that you are receiving are likely spam emails. Spam emails are unsolicited emails that are sent to a large number of people. They often contain malicious links or attachments that can infect your computer with malware.
There are a few things you can do to try to stop the "No Sender" emails from showing up in your Mail app on your cellphone:
- Check your spam filter. Make sure that your spam filter is enabled and that it is set to a high level of sensitivity. This will help to block most spam emails, including the "No Sender" emails.
- Update your Mail app. Make sure that you have the latest version of the Mail app installed on your cellphone. Apple often releases updates that fix security vulnerabilities that can be exploited by spam emails.
- Report the emails to your email provider. If you receive a "No Sender" email, you can report it to your email provider. They can investigate the email and take steps to block it from being sent to other users.
- Be careful about what links you click on and what attachments you open. If you receive an email from an unknown sender, never click on any links or open any attachments. These links and attachments can contain malware that can infect your computer.
If you have tried all of the above and you are still receiving "No Sender" emails, you may need to contact your cellphone carrier for help. They may be able to block the emails at the carrier level.