Re: Refuse mail from hosts with closed port 25

[Kevin A. McGrail]

On 9/16/2019 9:03 AM, Jim Reid wrote:
> On 16 Sep 2019, at 13:47, Paul van der Vlis <p...@vandervlis.nl> wrote:
>
> How can I refuse mail from hosts who don't have an open port 25?
Paul, I wrote a module which I need to update on Perl's CPAN called
Net::validMX that we use to reject IPv4 domains that aren't properly
setup to receive mail from sending to us.  We've used it in production
with MIMEDefang.  And as a small, boutique ESP for over a decade, likely
closer to 15 years with no complaints/FPs of note.
Regards,
KAM