setting quota through IMAP

[Daniel Tröder]

I'd like to set the quota of a user through the IMAP protocol. I use
Pythons imaplib:

imap.setquota("test1m at uni.dtr", "(storage 8192)")
('NO', ['Quota can be changed only by admin.'])

So... which user is the "admin" user in a virtual user setting (passwd:
PAM, userdb: LDAP)?

Greetings
Daniel

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