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https://issues.apache.org/jira/browse/JAMES-2950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17031266#comment-17031266
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René Cordier commented on JAMES-2950:
-------------------------------------

https://github.com/linagora/james-project/pull/2809 contributed to newly 
created usernames being forbidden to use above mentioned special characters in 
their local-part

> Username should not accept some special characters
> --------------------------------------------------
>
>                 Key: JAMES-2950
>                 URL: https://issues.apache.org/jira/browse/JAMES-2950
>             Project: James Server
>          Issue Type: Bug
>            Reporter: René Cordier
>            Priority: Major
>             Fix For: 3.5.0
>
>
> Able to create username with some special characters that should be 
> restricted, such as:  space and {{"(),:;<>@[\]}}
>  
> We should for more safety and reduce complexity not allow the use of those 
> for the username (more specifically, the local-part of the user address)



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