Hi Jochen,

the ID has not changed, in addition the "permission denied" error is random, most of the time Dovecot works well.

How can I check the mappings NFS uses?

After the Debian upgrade I was using these NFS mount options:

rw,user,rsize=8192,wsize=8192,timeo=30,intr

Now trying to fix the problem I set "defaults" mount option, but nothing has changed.

Thanks

On 13/07/20 13:08, Jochen Bern wrote:

On 07/13/2020 12:57 PM, Claudio Corvino wrote:

...

we just upgraded our mail server from Debian 8 to Debian 9, so our dovecot packages just got upgraded from version 2.2.13 to 2.2.17. [...] Every directory and sub-dir under /mnt/mail-storage is assigned to vmail:vmail with drwx------ permission set. Just a quick shot into the dark, you verified the ownerships on the NFS *client*, not the NFS *server*, yes? Because NFS speaks UIDs and GIDs, not their names, so if your Debian 9 installation assigned different IDs to "vmail" ...

(You might also want to check what mappings the NFS mount uses, including possible *default* behaviour.)

Good luck,