Let's encrypt email alert didn't work on certificate expiration after email address change

[utilsites]

In Restreamer Settings -> Network -> HTTPS (SSL/TLS) -> Let's Encrypt certification
I'm using the Email field
Please enter your email address to signify agreement with the Let's Encrypt CA's terms of service and to be notified in case of issues.

I had port 80 blocked by mistake, so let's encrypt couldn't renew the ssl certificate.
The certificate expired and I didn't receive a alert email as it was supposed. Checked on spam folder also.

So I'm wondering if this email alert functionality is working well, maybe is from Let's encrypt side, but the integration is working well?
In the past I changed the email to a new one... humm maybe this change only reflects on the next renewal? That would explain the issue.