On 16 Sep 2019, at 9:17, Kevin A. McGrail wrote:
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.
I don't believe that Net::validMX does anything more *at the domain
level* than Postfix's built-in reject_unknown_sender_domain restriction.
Its check_email_validity() may be a bit more strict than Postfix's
built-in address sanity checks.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
