mail_crypt module and error with tmp directory

Fiorenza Meini fmeini at
Mon May 3 11:16:28 EEST 2021

Il 03/05/21 09:47, Aki Tuomi ha scritto:
>> On 03/05/2021 10:42 Fiorenza Meini <fmeini at> 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

I have apparmor installed on the machine, but even if stopped it the 
problem didn't solved.

I think dovecot's systemd unit file configuration is this 

It's content is this:
# Type Path                    Mode UID  GID     Age Argument
d      /var/run/dovecot/       0755 root root    -   -
d      /var/run/dovecot/login/ 0750 root dovecot -   -

Should I insert here a line for /tmp directory ?

Thank you and regards


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