On 9/16/19 8:47 AM, Paul van der Vlis wrote:
Hello,
How can I refuse mail from hosts who don't have an open port 25?
What do you think from such a check?
DO NOT DO THIS!
A significant number of installations will use different servers for
inbound and outbound email. What is worth checking, is that the sender
has MX records.
Is there more needed? E.g. a list of exceptions for some big providers?
Background:
I've investigated why somebody did not receive mail from a virtual
machine, and I found out her provider (reviced.nl) refuses all mail from
a host what does not have port 25 open. I have much problems with spam
and I would like to reduce it.
--
John
PGP Public Key: 412934AC
