Bug: Spurious date check

The code at
https://github.com/apache/incubator-ponymail/blob/a65a09cceb17ce6877097856ae437ac977d00902/tools/list-lists.py#L67

checks whether the date of the entry is less than 2 days in the future.

There does not seem to be any reason for this.
Either the reason should be documented, or the check should be dropped.

Open tools/list-lists.py at line 67 and inspect the surrounding date handling to understand why entries less than two days in the future are checked. Verify the behavior and determine whether the rationale can be documented or whether the check should be removed; done means the behavior or its purpose is explicitly addressed.

Written by the indexing model from the issue text.