bruno.carva...@xervers.pt skrev den 2019-03-22 21:31:
Thank you all for your suggestions.
I will follow the path of using a whitelist and block everyone.
I can track the IPs, but i taught i could put in place something (like
OVH by example) do (If their system detects spam being sent, the port
on that ip is automatically blocked and the client alerted).
whitelist ?
you only need sasl auth
do not enable sasl auth on port 25, if it lists AUTH on port 25 ehlo,
you will need to remove it in postfix main.cf
enable sasl auth only on port 465 and 587
all else is insane
