[Discuss] Strange sendmail (and postfix) spam issue: accepting fail "from" myself?

[Rich Pieri]

On 3/29/2016 1:24 PM, Derek Atkins wrote:
> smtpd_relay_restrictions =

This looks like the problem. Remove it entirely from your main.cf and
restart Postfix. This should bring the default rules which will block
relay attempts from anyone that does not match $mydestination or is not
an authenticated user.

-- 
Rich P.