Originally Posted by sjau
Do you haven an open relay server?
Good question, one should never assume the obvious ...
Let me take a look ... but the standard install of postfix smtp only delivers email generated locally and postfix only delivers email locally ...
So in principle this should not happen.
Lets see ...
I have made
mynetworks_style = host
and relay is just from local machine
mynetworks = 127.0.0.0/8 has indicated in the man pages.
At what parameters should I take a look in the config to make absolute sure everything is setup correctly apart from this relating to relay ?
Also to notice is that this particular server does not have no domain MX record pointed to it.
It is a plain server, with just a few users.
No A records point to it, no MX records point to it.