Detecting disposable email domains without manual review
A throwaway address shows up in your signup form. Someone wants the free tier, the download, or the trial, and they have no intention of reading a single email you send. You only find out later, when your open rates sink and your bounce complaints climb. The fix most teams reach for first is manual review. A human scans the address, guesses whether it looks temporary, and decides. That approach…
Disposable email domains create issues with high bounce rates and low open rates. Manually reviewing each address is unreliable and inconsistent. The solution is to maintain a list of known disposable domains and check each new address against it. MailProbe, a service providing this list, performs the check locally, making it fast and cheap.
The list contains roughly 1,400 domains that cover the majority of throwaway signups. When a new popular temp-mail site appears, updating the list once solves the issue for everyone. The disposable check is performed first in the verification pipeline, before more expensive DNS queries. If the domain is flagged as disposable, there's no need to proceed with more costly checks.
Keeping the list current is crucial; a new provider may appear and the list must be updated to catch these addresses. However, there are limitations to list-based detection. Subaddressing, self-hosted throwaways, and catch-all domains are not caught by the list alone. Despite these limitations, combining list detection with other validation methods significantly reduces the issue of disposable email addresses.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
