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Disposable Email Domain validator library for Java

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valarpirai/disposable-emails-validator-java

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Why?

Use it to validate email addresses on sign up, or just to see how many real email addresses you have in your system.

<repository>  <id>github</id>  <name>GitHub Packages</name>  <url>https://<github_user>:<github_personal_access_token>@maven.pkg.github.com/valarpirai/disposable-emails-validator-java</url></repository>
<dependency>  <groupId>org.valarpirai</groupId>  <artifactId>disposable-email</artifactId>  <version>{version}</version></dependency>

Usage

We are using an autogenerated list which is updated every 24 hours -https://github.com/disposable/disposable

Getting latest Domain list

This lib has a list of disposable email domains (encoded file) inside resources.The following method will download latest disposable email list fromhere and use itNote: In your application startup, you need to call this method to fetch updated domain list.

DisposableEmail.refreshDisposableDomains()

Get DNS and disposable details of a email domain. ResponseDomainDetails

domainDetails = DisposableEmail.getDomainDetails("gmail.com")domainDetails.disposableDomain -> falsedomainDetails.mxRecordPresent -> true
domainDetails = DisposableEmail.getDomainDetails("yopmail.com")domainDetails.disposableDomain -> truedomainDetails.mxRecordPresent -> true
domainDetails = DisposableEmail.getDomainDetails("nonexisting123.com")domainDetails.disposableDomain -> falsedomainDetails.mxRecordPresent -> false

Check whether a given email address is disposable address (local check)

DisposableEmail.isDisposable("hello@gmail.com") -> falseDisposableEmail.isDisposable("hello@mailsac.com") -> true

Disposable domain with valid DNS MX Record

DisposableEmail.hasValidMailDomain("hello@mailsac.com") -> true

Valid domain without DNS MX Record

DisposableEmail.hasValidMailDomain("god.com") -> false

Use different DNS resolver

DisposableEmail.hasValidMailDomain("hello@gmail.com", DnsResolverType.CLOUD_FLARE) -> trueDisposableEmail.hasValidMailDomain("hello@gmail.com", DnsResolverType.GOOGLE) -> true

Whitelist Domains

DisposableEmail.addDomainToWhitelist("mailsac.com")DisposableEmail.isDisposable("hello@mailsac.com") -> falseDisposableEmail.removeDomainFromWhitelist("mailsac.com")DisposableEmail.isDisposable("mailsac.com") -> true

Blacklist Domains

DisposableEmail.addDomainToBlacklist("gmail.com")DisposableEmail.isDisposable("hello@gmail.com") -> trueDisposableEmail.removeDomainFromBlacklist("gmail.com")DisposableEmail.isDisposable("gmail.com") -> true

How it works?

  • We are using BloomFilter a space-efficient probabilistic data structure to store list of Disposable email domains
    • This will work in offline mode.
  • We are using DNS over HTTPS (DoH) to verify the MX Records
    • CloudFlare (1.1.1.1) and Google(dns.google) DNS resolvers are support
    • This will work in online mode. requires internet connection

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