Alexander Guril (Alex02) ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5bdcac0... ) *updated* an issue Hibernate Validator ( https://hibernate.atlassian.net/browse/HV?atlOrigin=eyJpIjoiNmYwNGZmYWZhO... ) / Bug ( https://hibernate.atlassian.net/browse/HV-1757?atlOrigin=eyJpIjoiNmYwNGZm... ) HV-1757 ( https://hibernate.atlassian.net/browse/HV-1757?atlOrigin=eyJpIjoiNmYwNGZm... ) Some RFC5322 conform email-addresses are incorrect validated by @Email ( https://hibernate.atlassian.net/browse/HV-1757?atlOrigin=eyJpIjoiNmYwNGZm... ) Change By: Alexander Guril (Alex02) ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5bdcac0... ) There are some RFC5322 conform email-adresses that are incorrectly validated by @Email. E.g.: * Abc@def(a)example.com * Fred\\ Bloggs(a)example.com * Joe.\\\\\\Blow(a)example.com [https://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-ad...] - 14.02.2020 [https://en.wikipedia.org/wiki/Email_address#Valid_email_addresses|https:/...] - 14.02.2020 I´ve provided a simple test-case: [https://github.com/AlexanderGuril/javax-validation-constraints-email-not-...] ( https://hibernate.atlassian.net/browse/HV-1757#add-comment?atlOrigin=eyJp... ) Add Comment ( https://hibernate.atlassian.net/browse/HV-1757#add-comment?atlOrigin=eyJp... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100120- sha1:2415f4c )