Hi,

I tried different senders and I always receive the same error. More of this, if 
I change back:

#smtp           inet  n       -       n       -       -       smtpd
smtp            inet  n       -       -       -       -       smtpd -o 
content_filter=spamassassin

to

smtp            inet  n       -       n       -       -       smtpd
#smtp           inet  n       -       -       -       -       smtpd -o 
content_filter=spamassassin

all comes back to working well.

So, I suppose a SpamAssassin related problem. Can I provide other useful 
information?

Thank you,
—Carlo

> On 02 Sep 2015, at 11:43, Kevin A. McGrail <kmcgr...@pccc.com> wrote:
> 
> On 9/2/2015 5:34 AM, Carlo Manuali wrote:
>> NOQUEUE: reject: RCPT from unknown Sender address rejected: Domain not found
> Are you sure the sender domain is legit and doesn't have a misspelling?
> 
> Is DNS on the box working?  I would conjecture this is much earlier in the 
> discussion phase with postfix and spamassassin isn't even involved in this 
> issue.
> 
> regards,
> KAM


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