Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/290
I just tried the same sequence and it worked OK for me.
I would try restarting the httpd server in case it is a caching issue.
Note that edit-list --delete does not remove the sources so the spam source
will still be in the database. It won't be accessible externally.
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