Karsten Otto created JAMES-3843:
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             Summary: VacationMailet should use null sender
                 Key: JAMES-3843
                 URL: https://issues.apache.org/jira/browse/JAMES-3843
             Project: James Server
          Issue Type: Improvement
          Components: Matchers/Mailets (bundled)
    Affects Versions: master
            Reporter: Karsten Otto


When the VacationMailet sends a vacation message, it uses the original 
recipient as envelope sender. However, RFC 5230 states
5.1. SMTP MAIL FROM AddressThe SMTP MAIL FROM address of the message envelope 
SHOULD be set to <>.
While we are technically OK because of the SHOULD, I do not see any real 
requirement to deviate from the recommendation. In fact, using the null sender 
can help prevent mail loops. So I propose we change the VacationMailet 
accordingly.



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