Demo account – Envelopes sent via API but recipients do not receive any email notifications

Hello,

I’m currently integrating DocuSign into my ERP system using the API, and I’m working with a developer (demo) account.

For several weeks, everything was working perfectly:

• Envelopes were successfully created via the API
• They were sent without any issues
• Recipients were receiving the email notifications and could sign documents normally

However, starting about a week ago, the behavior changed unexpectedly.

Now:

• The API still works correctly (no errors returned)
• Envelopes are created and sent successfully
• Recipients are correctly assigned
• But no recipient receives any email notification at all

To troubleshoot, I have tried:

• Sending to multiple types of email addresses (personal, professional, temporary emails)
• Recreating a completely new developer account → it worked once for a single envelope, then the same issue occurred again
• Checking API logs → no errors or warnings
• Verifying envelope status → shows as “sent”

Despite all of this, no email is ever received by any recipient.

At this point, I’m wondering:

• Is it possible that my IP address has been blocked or rate-limited?
• Could there be restrictions or limits on demo accounts that affect email delivery?
• Is there a known issue with email notifications in the demo environment?

I’m currently stuck because everything appears to work correctly from the API perspective, but the core functionality (email delivery) is failing silently.

Any guidance or suggestions would be greatly appreciated.

Thank you in advance.