{"id":475,"date":"2024-04-08T10:20:02","date_gmt":"2024-04-08T10:20:02","guid":{"rendered":"https:\/\/689cloud.com\/?p=475"},"modified":"2025-05-14T10:54:57","modified_gmt":"2025-05-14T10:54:57","slug":"5-common-mistakes-when-sending-sensitive-data-by-email","status":"publish","type":"post","link":"https:\/\/dev-website.689cloud.com\/ja\/blogs\/5-common-mistakes-when-sending-sensitive-data-by-email\/","title":{"rendered":"5 Common Email Mistakes That Put Sensitive Data at Risk \u2014 And How to Avoid Them"},"content":{"rendered":"
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In today\u2019s digital-first business environment, email remains one of the most widely used tools for communication and file sharing. But for organizations handling sensitive data, such as legal contracts, financial statements, health records, and proprietary business information, email can also be a significant security risk.<\/span><\/p>\n

Cybercriminals constantly seek new ways to exploit email vulnerabilities. Whether through human error or poor digital hygiene, a single mistake could expose your organization to data breaches, compliance issues, or financial loss.<\/span><\/p>\n

The article breaks down five of the most common email mistakes that put sensitive data at risk and offers practical solutions to address them.<\/span><\/p>\n

1. Sending Unencrypted Emails and Attachments<\/b><\/h2>\n

The risk<\/b>
\n<\/b>When sensitive data is sent via unencrypted email, it can be intercepted during transmission, especially when it travels over unsecured networks. This includes not just the body of the email but also any attachments, such as contracts or spreadsheets containing confidential information.<\/span><\/p>\n

The solution<\/b>
\n<\/b>Make encryption a standard practice across your organization. Use email services that support end-to-end encryption or enable TLS (Transport Layer Security) by default. For attachments, consider secure file sharing solutions like <\/span>689Cloud SecureMail<\/b>, which encrypts files and enables you to share access-controlled links instead of sending files directly.<\/span><\/p>\n

Why it matters<\/b>
\n<\/b>Encryption prevents unauthorized access\u2014even if the message is intercepted\u2014by rendering the contents unreadable without the correct decryption key. This adds a critical layer of protection, especially when dealing with financial data, intellectual property, or personal information protected by regulations like HIPAA or GDPR.<\/span><\/p>\n

2. Oversharing: Sending Emails to More Recipients Than Necessary<\/b><\/h2>\n

The risk:<\/b>
\n<\/b>It is common to CC or BCC multiple people for the sake of transparency. However, when emails contain sensitive information, this approach significantly increases the risk of data leakage. Even trusted team members might forward the email or download files to insecure devices.<\/span><\/p>\n

The solution:<\/b>
\n<\/b>Implement a <\/span>“least privilege” policy for information sharing. Emails and file links should only be sent to individuals who absolutely need access to the data. Use platforms like 689Cloud to set expiration dates, watermark documents, and restrict downloads\u2014even after the email has been sent.<\/span><\/p>\n

Why it matters:<\/b>
\n<\/b>Limiting access reduces your attack surface. The fewer people who have access to sensitive information, the lower the chance it ends up in the wrong hands, whether through negligence or malicious intent.<\/span><\/p>\n

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3. Attaching Files Directly Instead of Using Secure File Links<\/b><\/h2>\n

The risk:<\/b>
\n<\/b>Sending files as direct email attachments is not only outdated but also dangerous. Files can be intercepted, altered, or misused if they fall into the wrong hands. You also lose control of the document once it\u2019s downloaded.<\/span><\/p>\n

The solution:<\/b>
\n<\/b>Use a secure cloud-based file sharing platform like <\/span>689Cloud<\/b>, which encrypts files in transit and at rest. Instead of attaching files, share an encrypted link with controlled access permissions. You can track who opens the file, restrict downloads, revoke access anytime, and even apply digital watermarks.<\/span><\/p>\n

Why it matters:<\/b>
\n<\/b>Secure file links give you visibility and control. You will know who accessed the file, when, and from where, providing critical insights for auditing and compliance purposes.<\/span><\/p>\n

4. Using Weak or Reused Passwords<\/b><\/h2>\n

The risk:<\/b>
\n<\/b>Many employees still use weak passwords like “123456” or reuse the same password across multiple platforms. If just one of those platforms gets compromised, it could provide attackers with access to corporate email accounts.<\/span><\/p>\n

The solution:<\/b>
\n<\/b>Require <\/span>strong, unique passwords for all business email accounts. A strong password includes a mix of uppercase and lowercase letters, numbers, and symbols, and is at least 12 characters long. Encourage the use of password managers to store and generate complex passwords securely.<\/p>\n

Additionally, multi-factor authentication (MFA) should be implemented across all email accounts and file-sharing platforms to provide an extra layer of security.<\/span><\/p>\n

Why it matters:<\/b>
\n<\/b>Strong credentials and MFA can stop unauthorized access even if a password is stolen or guessed. According to Microsoft, MFA can prevent 99.9% of account compromise attacks.<\/span><\/p>\n

5. Ignoring Cybersecurity Hygiene: No Antivirus or Anti-Malware Protection<\/b><\/span><\/h2>\n

The risk<\/b>
\n<\/b>Opening email attachments without proper security software exposes your organization to ransomware, spyware, and other malicious threats. Attackers often use email as the initial vector to gain a foothold in your network.<\/span><\/p>\n

The solution<\/b>
\n<\/b>Install enterprise-grade antivirus and anti-malware software on all company devices. Keep the software updated and set up automatic scans. Train your team to recognize phishing emails, suspicious attachments, and other red flags.<\/p>\n

Why it matters<\/b>
\n<\/b>Cyberattacks are often preventable with the right tools and awareness. Preventive security tools reduce the chance that a malicious file or email will compromise your systems or data.<\/span><\/p>\n

Best Practices for Sending Sensitive Data via Email<\/b><\/h2>\n

To reinforce secure file sharing and communication across your enterprise, follow these best practices:<\/span><\/p>\n