dovecot - May 2021 - mail_crypt module and error with tmp directory

Hi,
I successfully enable mail_crypt module but I'm experiencing a strange 
behaviour with tmp directory while accessing with POP3 protocol:

I see in log file:
Error: istream-seekable: safe_mkstemp(/tmp/dovecot.pop3.) failed: 
Permission denied

I changed tmp directory configuration (mail_temp_dir variable) and 
setting it with 777 permission, but the error is the same.

On client side it's working everything, but I'd like to understand the 
error and if I have to be worried about it.

Thank you and regards
Fiorenza

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> On 03/05/2021 10:42 Fiorenza Meini <fmeini at esseweb.eu> wrote:
> 
>  
> Hi,
> I successfully enable mail_crypt module but I'm experiencing a strange 
> behaviour with tmp directory while accessing with POP3 protocol:
> 
> I see in log file:
> Error: istream-seekable: safe_mkstemp(/tmp/dovecot.pop3.) failed: 
> Permission denied
> 
> I changed tmp directory configuration (mail_temp_dir variable) and 
> setting it with 777 permission, but the error is the same.
> 
> On client side it's working everything, but I'd like to understand
the
> error and if I have to be worried about it.
> 
> Thank you and regards
> Fiorenza
> 
> -- 
> Fiorenza Meini/Spazio Web
> 
Are you by chance using selinux or apparmor there which could prevent this? Also
Dovecot's stock systemd unit prevenst you from writing into random
locations, /tmp should be fine though.

Aki