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I just upgraded dovecot from 2.1.7 to 2.2.13, and my previously working configuration broke.

I have one user with an empty prefix in his default namespace:

Error: XXXX: Initialization failed: namespace configuration error: list=yes requires prefix=yes to end with separator
Error: Invalid user settings. Refer to server log for more information.

The prefix is set to empty via the userdb: 

XXXX:YYYY::::::userdb_namespace/inbox/prefix=

Unfortunately, I could not find any other configuration. With 

XXXX:YYYY::::::userdb_namespace/inbox/prefix=.

I get 

namespace configuration error: list=yes requires prefix=. not to start with separator

What is the correct way to get the old behaviour with 2.2.13?

Joachim Breitner
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  • It might be that this problem is independent of namespaces, and rather the more general question: “How to set a configuration variable to the empty string via `userdb`?” – Joachim Breitner Jul 18 '15 at 10:06
  • It sounds like your prefix definition is wrong. You can't have `prefix=.` if `separator=.`. You would probably need something like `prefix=INBOX.` or maybe an empty prefix. – Alexis Wilke Nov 08 '20 at 17:16

1 Answers1

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I worked around the issue by defining the namespace in the configuration twice (inbox and inbox_alt, with the latter with disabled = yes), and put this in the userdb:

  userdb_namespace/inbox/disabled=yes userdb_namespace/inbox_alt/disabled=no

This way, I could successfully set prefix in inbox_alt to the empty string.

Joachim Breitner
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