On 12/13/21 10:36 AM, Bill Cole wrote:
Also simple: NEVER try to interpret or canonicalize local-parts that exist in someone else's domain. You cannot programmatically determine whether 2 different local-parts are equivalent unless you run the delivery system for them.
This is correct and Mailman does maintain case-preserved email addresses for delivery, but internally, Mailman 2.1 list members are lower-cased email addresses (It is not possible to have two list members whose addresses differ only in case), so comparing lower-cased email when trying to determine if two list member addresses are the same member is OK.
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