>> I am getting the following error when Postfix attempts LMTP delivery :
>>
>> "lmtp(REDACTED)<32674><7Jm0BSVopmaifwAAbW4UVQ>: Fatal:
>> setresgid(121(mailbox_user),121(mailbox_user),8(mail)) failed with
>> euid=111(mailbox_user): Operation not permitted"
>>
>> mailbox_user is uid 111, gid 121 on my system.
>>
>
> Not related to low uid/gid numbers? I think newer OS have their limits
> increased to above 1000 or so.
>
Well, my OS is Debian Bookworm which should be "newer" enough ? ;-)
User/group were originally created via :
adduser --system --disabled-login --shell /usr/sbin/nologin mailbox_user
addgroup --system mailbox_user
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