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https://issues.apache.org/jira/browse/MAILET-5?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529803
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Danny Angus commented on MAILET-5:
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Norman, sorry I've had little time recently. I agree that it could be improved 
along the lines you suggest, but we also need to work out what our plan is.


> Currently our getRecipients expose the internal collection and it is used 
> that way.
> -----------------------------------------------------------------------------------
>
>                 Key: MAILET-5
>                 URL: https://issues.apache.org/jira/browse/MAILET-5
>             Project: Mailet API
>          Issue Type: Improvement
>          Components: Core API
>    Affects Versions: 2.3
>            Reporter: Norman Maurer
>            Assignee: Norman Maurer
>             Fix For: 3.0
>
>
> Currently our getRecipients expose the internal collection and it is used 
> that way.
> To add recipients we use getRecipients().add(), to store multiple times a 
> single mail to different recipients we get the recipients collection and 
> alter it between store of the mail object (in RemoteDelivery).
> All of this seems to me bad practice and we should better encapsulate the 
> recipients list in the mail object.
> Maybe the simple way is to return immutable collections so we'll find bugs as 
> soon as possible and add methods to add and remove recipients directly in the 
> mail interface.

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