Most of these temporary email providers provide a web UI for retrieving emails from the temporary inbox. If they copy the link and paste it into new tab, you'd lose the Referrer. If they're lazy and just click it then it'll we'll get the Referrer and our logic will work.
There might be browser settings that drop the Referrer for the sake of privacy, or extensions that do this, so it's not perfect but I collect enough new domains from this method that I was glad I stumbled on it.
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Most of these temporary email providers provide a web UI for retrieving emails from the temporary inbox. If they copy the link and paste it into new tab, you'd lose the Referrer. If they're lazy and just click it then it'll we'll get the Referrer and our logic will work.
There might be browser settings that drop the Referrer for the sake of privacy, or extensions that do this, so it's not perfect but I collect enough new domains from this method that I was glad I stumbled on it.