[Info-vax] SMTP anti-spam

[John E. Malmberg]

On 1/6/2015 11:39 AM, Stephen Hoffman wrote:
> On 2015-01-06 17:31:02 +0000,   VAXman-  @SendSpamHere.ORG said:
>
>> Well, in the past, I never had any issues when sending email from EISNER.
>
> That usually means that the sending address or sending mail server was
> whitelisted, that the sending server passed a greylisting check, or that
> the message received enough credits from other attributes, or that the
> receiving mail server didn't care about the DNS of the sending server.
> Or the folks that didn't get the misclassified-as-spam message didn't
> notice the message was missing and/or the folks retrieved the message
> from a spam folder, of course.

Checking the EHLO/HELO against the rDNS is a political statement by a 
small number of people, not a mainstream anti-spam check.

The only mainstream anti-spam check on the rDNS, is simply that the rDNS 
exists.  Again, stricter checks are only a political statement by a 
small number of people.

Those political checks are not mainstream because of two major reasons:

1. They are not effective in stopping additional spam that is not 
already stopped by simpler checks.

2. They are known to cause legitimate e-mail to be refused.

All Eisner or any other mail server needs for outgoing e-mail to be 
universally accepted is an rDNS that does not have the text "dhcp", 
"dynamic" or similar in it.

STATIC-96-252-127-67.BSTNMA.FIOS.VERIZON.NET should not cause any 
problems, though I would hope that a more informative rDNS can be obtained.

Regards,
-John
wb8tyw at qsl.network
Personal Opinion Only