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https://issues.apache.org/jira/browse/JAMES-941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Norman Maurer resolved JAMES-941.
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       Resolution: Fixed
    Fix Version/s: 3.0-M1
         Assignee: Norman Maurer

> FetchMail initializes some mail attributes with "null" values, which are then 
> ignored by HasMailAttribute matcher.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: JAMES-941
>                 URL: https://issues.apache.org/jira/browse/JAMES-941
>             Project: JAMES Server
>          Issue Type: Bug
>          Components: FetchMail
>    Affects Versions: 2.3.2
>            Reporter: Aleksey Medvedev
>            Assignee: Norman Maurer
>            Priority: Minor
>             Fix For: 3.0-M1
>
>
> I needed to resend all messages delivered by FetchMail to users, who are not 
> defined to James, into postmaster's mailbox. To do so I've added a new mailet 
> with HasMailAttribute matcher to process messages with 
> "org.apache.james.fetchmail.isUserUndefined" attribute. But this mailet has 
> never been actually invoked in spite of the aforementioned attribute presence.
> In the FetchMail's source code I've found that all attributes which do not 
> assume some particular value, are initialized by nulls:
>         if (isUserUndefined())
>             aMail.setAttribute(getAttributePrefix() + "isUserUndefined", 
> null);
> But HasMailAttribute matcher ignores attributes with null values:
>         if (mail.getAttribute (attributeName) != null) {
>             return mail.getRecipients();
>         } 
> If I assign arbitrary not null value to the attribute like this
>             aMail.setAttribute(getAttributePrefix() + "isUserUndefined", 
> "true");
> the matcher works fine and my mailet is then invoked.
> Thereby we have some incorrectly initialized attributes which are definitely 
> ignored by matchers (and possibly cause some other troubles).

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