[AusNOG] Disturbing new spam trend?

[Noel Butler]

On 07/10/2015 13:41, Ross Wheeler wrote:
> On Wed, 7 Oct 2015, Chris Prangnell wrote:
> 
>> Your friends mailserver needs TLS enabled. Then it would have not 
>> accepted
>> the mail.
> 
> He got the backscatter... the "undeliverable" message.
> How would either TLS or SPF have helped in this instance?
> 


SPF if setup correctly using hardfail would (should) have 550'd during 
initial connection from badguy, should not have been any backscatter 
generated. TLS, probably because of how 95% of mail servers are setup, 
would not save you in this case.