Initialization failed: Namespace '': mkdir(/var/www/mail) failed: Permission denied

[trash at skrilnetz.net]

  Quoting Steffen Kaiser <skdovecot at smail.inf.fh-brs.de>:

> On Thu, 26 Oct 2017, trash at skrilnetz.net wrote:
>
>> /dovecot: lda(www-data): Error: user www-data: Initialization  
>> failed: Namespace '': MKDIR(/VAR/WWW/MAIL) failed: Permission  
>> denied (euid=33(www-data) egid=33(www-data) missing +w perm:  
>> /var/www, dir owned by 1001:1001 mode=0755//)  /
>>
>> I did some troubleshooting and I don't understand where  
>> the MKDIR(/VAR/WWW/MAIL) is coming from. Mailboxes are in /var/mail  
>> and
>
> ^^ /var/mail contains the INBOX only
>
>> sending/receiving emails is working as it always did.
>>
>> mail_location is still setup to be MAIL_LOCATION =  
>> MBOX:~/MAIL:INBOX=/VAR/MAIL/%U
>
> Everything else is in ~/MAIL (why uppercase?)
>
>> Why is it trying a mkdir in /var/www?
>
> Because most likely /var/www is the home directory of www-data and  
> you've configured to use $HOME/MAIL as base directory, which is  
> /var/www/mail
> - -- Steffen Kaiser

I don't know where the uppercase is coming from. In the email I've  
sent its lower case.

How can I fix that without changing permissions of /var/www? Where is  
$HOME/MAIL configured? Why do I get this error now for the first time,  
when there was no change to the system configuration?
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