On 2014-02-20 21:15, Boris wrote:

If Dovecot would give any error message to the user he would be able to check
the existence of mailboxes. In reality imho this isn't any additional
insecurity since I could simply send an email to this mailbox and would
receive a "delivery failed" message thus knowing of it existence.

what if the email is an alias ?, it still does not revail if its local or remote

and there is still the possible that more then one alias have a single mailbox

so you loose there :=)

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