On 2020-09-03 09:42, Marc Roos wrote:
PTR record, SPF, DKIM and DMARC are also set by spammers, and sometimes
even just before a spam run. It is either choosing to do amazons work or
not having any work. If more and more are blocking the amazon cloud it
would make their clients leave and this finally migth have them spend
more on their abuse department.
For your information, AWS apparently blocks TCP port 25 unless the
customer (not someone hacking an AWS instance) explicitly requests a
custom PTR record using a form where the customer promises not to Spam.
Custom PTR records don't look like
ec2-184-72-79-140.compute-1.amazonaws.com .
I am unsure how Richard's example that obviously tricked a server to
send a HTTP request to the OpenSSL mail server got past the port 25
block (this appears to be a common form of server side request forgery).
-----Original Message-----
To: openssl-users@xxxxxxxxxxx
Subject: Re: Testing
On 2020-08-31 16:28, Marc Roos wrote:
Why don't you block the whole compute cloud of amazon?
ec2-3-21-30-127.us-east-2.compute.amazonaws.com
Please note, that at least our company hosts a secondary MX in the EC2
cloud, with the option to direct my posts to the list through that
server. However proper PTR record, SPF, DKIM and DMARC checks should
all pass for such posts.
Thus rather than blindly blacklisting the Amazon hosting service, maybe
make the OpenSSL mail server check those things to catch erroneous
transmissions from web servers.
-----Original Message-----
To: openssl-users@xxxxxxxxxxx
Subject: Testing
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Enjoy
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