[Dovecot] Strange issue with doveadm user

[Antoine Nguyen]

Dear all,

I encounter a strange issue with the *doveadm user* command. (dovecot
2.1.16)

I try to retrieve information about a specific user but dovecot says it
doesn't exist (whereas I just created it). The following command fails:

$ sudo -u vmail doveadm user pouet at domain.tld
userdb lookup: user pouet at domain.tld doesn't exist

If I try a more global lookup, the user is properly found:

$ sudo -u vmail doveadm user *@domain.tld
user1 at domain.tld
*pouet at domain.tld*

Sending a query for another user works well. For example :

$ sudo -u vmail doveadm user user1 at domain.tld
userdb: user1 at domain.tld
  home      : /var/vmail/domain.tld/user1
  uid       : 500
  gid       : 500
  quota_rule: *:bytes=100M

I really don't understand what's happening... The only difference I see
between the users is that user1 was created when I was using dovecot 1.2...

Thanks for your help.