In the first quarter of 2026 alone, ransomware attacks disrupted the University of Mississippi Medical Center’s Epic electronic medical record and forced Stryker Corporation to shut down internal systems; hackers linked to the GENESIS group used double-extortion tactics against a nonprofit serving HIV patients; and other incidents at Community Health Action of Staten Island, NADAP and UFP Technologies forced clinicians back to paper charts.

The Paubox 2026 Healthcare Email Security Report noted that 170 healthcare email-related breaches were reported to the U.S. Department of Health and Human Services’ Office for Civil Rights in 2025. 74% of compromised organizations did not enforce effective DMARC, and none enforced MTA-STS encryption. More than half of the compromised organizations used Microsoft 365. The report also uncovered that it takes many organizations an average of 308 days to discover and contain a breach.

As we can see, breaches result in loss of trust, but the bigger problem operationally is that it is difficult to reconstruct communication events. “Patients must be able to trust that sensitive health information in their files is protected to preserve their trust in the patient‑doctor relationship and ensure they get the care they need,” said Melanie Fontes Rainer, former director of the Office for Civil Rights. An audit trail has become a required layer of evidence for patient communication. An audit trail is a detailed, tamper-evident record of who did what, when, and through which system.

 

The latest enforcement trend is about proof

Regulators have long required policies on privacy and security, but current enforcement emphasises verifiable evidence. Under the Security Rule, covered entities must implement technical safeguards, including audit controls, to record and examine system activity. The HITECH Act reinforced this requirement by demanding that EHR‑using covered entities provide an audit trail accounting for all disclosures of information when patients request electronic copies.

Huilgol et al. found in a review that EHR audit logs are part of the bigger picture of why regulators want evidence. In oncology, the audit log has been underutilized, yet it offers a unique view into physician behaviour as it records access patterns without the need for human observers, enabling validation of workflows and detection of unusual activity. The review explains that the EHR audit log requirement was baked into the HIPAA Security Rule of 2005 to provide accountability and support privacy protections.

However, without formal audit processes, logs can become an unreviewed data lake. Regulators’ recent settlements and enforcement actions increasingly ask whether organizations can produce logs to show they identified risks, controlled access and responded appropriately.

 

Email remains one of the clearest examples of why audit trails matter

Email continues to be the front door for attackers and a core communication channel for care. Verizon’s 2026 Data Breach Investigations Report notes that miscellaneous errors have consistently been a top breach pattern. The most common errors are misdelivery (sending data to the wrong recipient), loss of unencrypted devices, and misconfiguration (exposing data stores to the internet without controls).

The report emphasizes that such errors persist despite repeated recommendations and that 81% of healthcare breaches involve system intrusions, miscellaneous errors, or social engineering. Initial access vectors include exploitation of vulnerabilities (20%), phishing (14%), and credential abuse (11%). The human element plays a role in 54% of breaches, while third‑party relationships contribute to 32%.

Email misdelivery and misconfiguration can directly expose PHI, and when a breach occurs, investigators must determine if the message contained patient data, who accessed it, and if notifications are required. Without an audit trail of email activity, including sender and recipients of email, time and date, delivery status, encryption status, and authentication events, organizations can either underreport or overreport the scope of a breach.

 

Audit trails help distinguish legitimate access from suspicious access

Another lesser-known benefit of audit trails is the ability to tell the difference between legitimate communication and suspicious activity. Good audit trails capture all system activity, including a time stamp and user ID, to provide accountability and integrity of the record. Audit logs record all data reads/writes, inferences, user actions, and messages sent so that investigators can trace errors or biases back to specific inputs.

For example, the review explains how the audit log data set can be used to tell which clinician looked at a chart, for how long, and which notes they looked at. Access patterns are role-based expectations. Odd patterns (such as a finance employee reading clinical notes) can be a violation of privacy. And what is also crucial is that the audit logs are created automatically. The audit trail can help organizations piece together a story, and they do not have to rely on memory or manual screenshots. It becomes necessary to respond to patient complaints, regulatory investigations, or lawsuits.

 

Automation makes audit trails more necessary

It often transmits more PHI on channels without further oversight. Paubox’s breach analysis revealed that 85% of healthcare IT leaders believe staff are using unauthorized AI tools, but only 26% say they have any visibility into that usage. Organizations using generative AI tools to generate and deliver messages or to automatically send appointment reminders or lab notifications need to ensure that each message has a verifiable audit trail. Automation also equals speed, as thousands of patients can be impacted by misrouted messages or misconfigured templates before anyone is aware.

So, audit trails should cover manual emails and API-powered notifications, portal messages, secure forms, and AI-supported drafts. You need to specify the template used for each event, the data fields, patient identifiers, message channel, and vendor involvement. Logs should include vendor access, data sent, and any errors if the vendor is part of the workflow. Healthcare leaders cannot tell the difference between a misconfiguration and a malicious actor or prove compliance with regulators without this evidence.

 

Where Paubox fits

By default, the Paubox Email Suite encrypts outbound messages and keeps logs of sender and recipient addresses, timestamps, encryption status, and delivery outcomes. Its email API and archiving products are designed to create a tamper-evident audit trail of all message activity, including API-generated transactional emails. Many vendors are HIPAA compliant in name only, but Paubox combines encryption, threat detection and auditable logs; it is HITRUST CSF certified and provides business associate agreements, making it simple for covered entities to meet regulatory requirements.

Audit trails alone are not enough to stop breaches. With platforms like Paubox that provide proof of who sent what, when, and under what security controls, organizations can identify anomalies faster, accurately scope incidents, and show due diligence. Incorporating these tools into broader security programs, including policies, user training, vendor management, and incident response, creates a resilient communication infrastructure.

 

FAQs

Can APIs be used to send patient emails?

Yes. APIs can be used to send patient emails when they are connected to an email service that supports healthcare privacy and security requirements.

 

What should an API audit trail include?

An API audit trail should include the timestamp, sending system, authenticated user or service account, recipient, message type, delivery status, error messages, encryption status, IP address or application source, and any changes made to templates, credentials, or routing rules.

 

How long should API audit logs be retained?

HIPAA does not give one simple retention period for every technical log, so organizations should follow their legal, compliance, operational, and security requirements.