virtual users, mailer daemon send mails to non existant recipient and dovecot store it

[Tanstaafl]

On 8/23/2016 11:57 AM, Sam <sr42354 at gmail.com> wrote:
> The problem is that the sender of the spam as something like 
> voicemail at ourdomain.fr ( the user voicemail doesn't exist in our database )
> 
> And sometimes dovecot create the directory and store the reply 's mail...

1. Don't accept mail for non-existent (invalid) users

2. Don't accept mail from domains that you control that don't originate
from your smtp server(s)

Problem solved.