When an email is sent by sendgrid to an email address with an invalid
host, the webhook payload does not contain the "status" field:
```
[
{
"bounce_classification": "Unclassified",
"email": "noemail@this.does.not.exist.tld",
"event": "bounce",
"reason": "unable to get mx info: failed to get IPs from PTR record: lookup <nil>: unrecognized address",
"sg_event_id": "Ym91bmNlLTQtNTA0ODUxOTUtZXVvMmlLeGRTYXlQRjRZRTQtLUk3QS0w",
"sg_message_id": "euo2iKxdSayPF4YE4--I7A.recvd-5f54b5d587-pczjm-1-67BADEEA-6.0",
"smtp-id": "<870b3a2a-160c-4fc8-bc9a-bd0d5b943b81@forum.umbraco.com>",
"timestamp": 1740300320,
"tls": 0,
"type": "blocked"
}
]
```
When the `status` field is missing, it results in a `NoMethodError
(undefined method `[]' for nil:NilClass)`
error in the controller method. In this commit, we will specifically
handle the webhook event from sendgrid when the email address's domain
is invalid.
Co-Authored-By: @nul800sebastiaan
209d289772