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?
On 16 Sep 2019, at 9:17, Kevin A. McGrail wrote:
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.
On 16.09.19 09:59, Bill Cole wrote:
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.
you can both still add checking for bogus MX records, e.g. poinging to
private/reserved address space, MX pointing to CNAME etc.
The first can be done in postfix by using check_sender_mx_access, for the
latter you need using something like rfc-clueless blacklist.
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