[Dovecot] Auto Vacation replies again

[Eduardo M KALINOWSKI]

CJ Keist escreveu:
> Stephan,
>    Thank you.  I understand what you are saying in trying to keep a
> vicious cycle of auto-replies responding to each other.  But in our
> environment I don't have any choice as our central virus/spam email
> gateway will can any message without a valid from address in the headers

The messages do have a valid from address in the headers - but their 
Envelope From address is empty, as the RFC recommends. These are two 
different things.