Markus Grandpré writes:

 > We've encountered an issue with Postorius after migrating from
 > Mailman 2.1. It appears that Postorius is treating email addresses
 > with differing capitalization as distinct user accounts. For
 > example, <markus.grand...@uni-konstanz.de> and
 > <markus.grand...@uni-konstanz.de> are being recognized as separate
 > identities.

That's not true on the systems I've worked with most recently -- those
will be recognized as duplicate addresses, both at list import time and
at login on Postorius.  Those are versions Mailman 3.3.9 and 3.3.11,
with corresponding Postorius.  As far as I can tell the last case-
sensitivity bugs were fixed as of Mailman 3.2.1 (released 2019-02-22).
Postorius does not appear to have had any case sensitivity bugs (not
surprising since Postorius just passes them through to Mailman).

I guess it's possible that this is a Debianism, or there was a
temporary regression around 3.3.8.

 > Is there a known configuration option or method within Postorius
 > (or Mailman 3 itself) to normalize or unify account identification,
 > effectively treating email addresses as case-insensitive for
 > account matching?

There is no such configuration option because Mailman has treated
email addresses as case insensitive for quite a while.  All I can
recommend is an upgrade.

Steve
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