Markus Grandpré writes:
 > Dear Steve, dear list
 > 
 >  > That's not true on the systems I've worked with most recently -- those
 >  > will be recognized as duplicate addresses (...)
 > 
 > You are right. I am sorry for this confusion. Please let me correct my 
 > initial posting to this list from yesterday, saying:
 > 
 >  >> (...) <markus.grand...@uni-konstanz.de> and 
 > <markus.grand...@uni-konstanz.de> are being recognized as separate 
 > identities.
 > 
 > That is not the case. Meanwhile I discovered an error with logging into 
 > Postorius when an account is associated with two semantically identical 
 > email addresses that differ in their formatting, e.g.,

Yes.  Apparently this is a problem of a policy difference between
Mailman 3 and the Django allauth package, as Bernhard Lichtinger
pointed out in
<https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/message/MP3PPOFCFFGYZDBZAFZTTJNPLND7TLXX/>

allauth takes the point of view that the localpart of an email address
is the "property" of the provider of the mailbox, and therefore should
be taken verbatim by third parties.  Mailman takes the more practical
point of view that, in practice, almost all providers treat localparts
as case insensitive.  (Some -- Gmail, grrrrr -- go farther and ignore
whole characters such as periods.)  The problem is that users treat
email addresses as case insensitive, and aren't very careful about
using the same case every time.  That's why I think the Mailman
approach is appropriate.

 > To resolve the issue, the only solution I found was to manually delete 
 > the second email address from the database:

That will work in the short run, but I'm not sure that's a long-term
solution.  It's not clear to me that allauth won't do the same thing
again.

 > Could I have achieved the same deletion using the REST interface?

I don't know.  I would think not.  I suspect Mailman code can only
find the lowercase version.  Mark has a script that looks for such
duplicates using psycopg, not mailmanclient, so it accesses the
database via the PostgreSQL API, not Mailman's REST API.  It deletes
any duplicate that is not all-lowercase:

https://github.com/pennersr/django-allauth/issues/3019#issuecomment-2440231640

 > I am not entirely sure how the duplicate email address came into the 
 > system.

allauth did it.  It's explained in the issue where Mark's script is
attached.  It's not very easy to follow the discussion, though.  And
there's something weird going on because in your stack trace, it
appears that allauth is doing a case insensitive database search.  So
I would just grab the script and run it, in case there are other users
with extra addresses that compare equal when comparison is case
insensitive.

 > I apologize again for the incorrect information in my initial message to 
 > this list.

No need to apologize.  It's extremely complicated.  Of course we're
happy if you look around and figure out most of it for us!

Steve
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