The DEA-Detector checks email addresses against a verified list of providers for temporary addresses, also known as “trash domains”, such as temp-mail and mailinator.
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DEA Checks
Examples:
What are trash email addresses?
DEAs are, at first sight, short-lived inboxes under a temporary address. Users are concerned about privacy, and in order to keep their real inbox spam-free, they turn to such quick hacks.
Why your business probably should reject them
From a user perspective, this can be a legitimate move. However, you as a service provider will not be able to reach the person later on. If you don’t need to, don’t even ask for an email. If you do, require a valid one and not disposable.
An overlooked fact is that the “temporary” email addresses are not temporary, but forever and public. Anyone can access those inboxes under random local-part strings. Anyone can request and see password reset links and such.
How Optimaize detects them
DEA is a cat-and-mouse game. Besides the old well known domains that everyone who does block blocks, there are new domains appearing daily. Some from existing providers that swap out the domain in use to avoid the block, others from completely new providers.
Our DEA Detector is part of a larger software to classify and validate email addresses. (This software is not available as an API to the general public.)
Not only do we detect DEA, but instead classify the domain names into freemail, ISP, organization, etc. A misclassification of a popular domain like yahoo cannot happen. In a log analysis from 2015, 92% of all email addresses could be classified, out of which 0.265% were disposables.
1. On domain level
a) We maintain our own base lists of human-verified domain name classifications. (The internet offers plenty of DEA lists, but most of them contain errors, and some are serious.)
b) New domains added by existing trashmail providers become visible as soon as they are put in use. And that’s where we get them, almost instantly.
c) Then we use crowd-sourced and user-contributed data to block new domains in real time.
d) And finally we analyse the logs periodically to classify the most popular yet unknown domains.
2. On mail server level
Some providers of temporary email addresses change their domain names frequently to avoid the blocklist, but re-use the same mail servers, and their mail servers’ only purpose is for temporary addresses.
Suggestions on handling the API results
In rare cases it may happen that we have a not too popular domain name categorized as disposable when in fact “freemail” is the better category.
To cope with this risk:
For new account signups etc, you can refuse disposable email addresses. As a result, the user can fall back to his real address, which will usually be a freemail address such as gmail. You may want to store a flag in the record that the signup attempt was with a disposable. Alternatively you can silently accept and flag it.
If you clean up existing records, we suggest to either send an account verification email, or to disable the accounts with disposable addresses as a first step. If you get legitimate complains from users of the same domain name then you still have the chance to manually review and re-activate a certain domain.