Email automation logs can accidentally contain bearer tokens, recipient lists, complete message bodies, or attachments. Keep enough information to diagnose the workflow without treating the entire mailbox as debugging data.
Inspect what each log statement records
Review request and response dumps, exception handlers, and logging middleware. A sanitized success message is different from serializing a complete OAuth response or Gmail resource. Avoid putting credentials in URLs, since those can also appear in logs and monitoring systems.
Prefer an operation reference, result category, timestamp, and limited counts. Where user correlation is necessary, use an approved identifier rather than automatically recording a personal address. Google’s Apps Script logging guide describes temporary active-user keys for some diagnostic uses.
Check access and retention
The lightweight execution log and persistent Cloud Logging have different lifetimes and access paths. Review who can read the relevant project and monitoring destination. A private script does not prove that every downstream log sink has the same permissions.
Set an appropriate retention and redaction policy with the responsible administrator. Avoid deleting broad audit history merely to hide an accidental disclosure; preserve the evidence required for the incident while preventing further unnecessary logging.
Respond to an exposed secret through the proper process
If a real access token, refresh token, or other credential was logged, treat it as a potential disclosure and follow the authorized revocation or replacement procedure. Removing the text from the current script does not invalidate a credential already copied elsewhere.
Test the revised logger with harmless sample data and a controlled failure. Confirm that useful error reasons remain visible while secrets and message contents are absent. Record the affected log locations and access scope without posting the sensitive values into another support ticket or chat.
Browse Gmail & Google Account help
References
- Logging | Apps Script | Google for Developers
- Using OAuth 2.0 to Access Google APIs | Authorization | Google for Developers
Reviewed against the linked official product guidance on November 3, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.