On 23 Apr 2019, at 11:46, John Peach wrote:
On 4/23/19 11:39 AM, Paul wrote:
Yes I agree with Kevin here, the best solution to this problem is an
spf record set to reject mail from any ip that’s not in your
allowed list of ips for your domain. Forging a from address is very
easy and is one of the main purposes of why spf was created.
There is no need to go to those lengths - assuming that all your own
email is being submitted over port 587, include -o
receive_override_options=no_header_body_checks in the master.cf entry
for submission and use a PCRE header checks file for port 25.
/^From:.*\@example\.com/ REJECT
So you don't want to accept messages you or anyone else in your domain
posts to a mailing list such as this one?
Seems risky...
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Available For Hire: https://linkedin.com/in/billcole
