All mainstream mailboxes have certain security measures, so no mailbox is absolutely safe.

However, you can take some measures to protect your mailbox, such as:

1. Use strong passwords: Avoid ordinary passwords and use complex passwords containing uppercase and lowercase letters, numbers and special characters.

2. Install antivirus software: it can help you find and remove viruses, Trojans and other malicious software.

3. Be careful of email links: If you receive an email from an unknown sender, or the email contains an unknown link, please be careful. These links may be download links of malware or fraudulent links.

4. Turn on two-step authentication: Many mailboxes provide two-step authentication, which will make your mailbox more secure. Two-step authentication will require you to enter your mobile phone verification code when logging in to your email, so that even if someone knows your password, they can't log in to your email.

5. Back up your mail: Back up your mail regularly, so that if your mailbox is attacked, you won't lose important information.

In short, the most important thing is to protect your account password and update it frequently.