Which of the following is NOT a benefit of using email digital signature certificates?

Using email digital signature certificates carries specific benefits that enhance the overall security and trustworthiness of email communications. The primary purpose of a digital signature is to authenticate the sender by providing a unique cryptographic signature that verifies their identity. This process enables verification of sender identity, ensuring that the recipient can confirm the message comes from a genuine source.

Additionally, digital signatures contribute to the integrity of the email. This means that any alterations to the email after it has been signed can be detected by the recipient, thereby preserving the authenticity of the message's content.

Furthermore, increased email security is a direct benefit of digital signatures. They protect against impersonation and help maintain the confidentiality of communications.

However, improved email deliverability is not a benefit associated with digital signatures. While secure and verified emails may be viewed more favorably by some recipients' email systems’ filters, digital signatures themselves do not guarantee that an email will reach its intended recipient's inbox, nor do they mitigate issues like spam filtering or bounces. In other words, while digital signatures focus on authentication and integrity of the message, they do not directly influence the likelihood of the email being delivered successfully.