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["Niels Dettenbach (Syndicat IT & Internet)" <nd AT syndicat.com>]

Am 23. Dezember 2014 21:48:55 MEZ, schrieb Riley Baird 
<riley AT openmailbox.org>:

>Would it be possible to reduce the spam problem by only accepting mail
>for the OpenNIC TLDs and rejecting mail for the ICANN TLDs? Given that
>OpenNIC TLDs are not yet as popular as the ICANN TLDs, it would seem
>that they would be less likely to get spam.
Hmm,
these are susually bad ideas, except requiring smtp auth or similiar for 
outbound relay users which should be "standard" in  most setups. Because many 
of our customers are using mailing list software with hundredthousands of 
recipients limiting  the  amount of email per day  by user is not a solution 
and limiting mails by ip or sender (domain/address)  on incoming mail makes 
no sense as this will block reuired mail traffic in many legal / non abusive 
scenarios.

Email by rfc only makes sense if it reaches the "full internet" net neutral 
(shure,  OpenNIC is'nt routed from most  mailers  yet...).

There are many other things a professional mail service provider can  do to 
minimize spam from and to his users, without restricting them, but many of 
them makes only sense on a pprofessional level which means that it is "easy" 
to get some kind of email service running, but doing that on a professional 
level  requires competence and manpower which most individuals or smaller 
companies did not have or can afford on their own, which makes hardly sense 
to use a professional "mail gateway" provider for MTA, MX and similiar 
internet email relaying.

f.i. we are able  to block / filter more then 98% of any spam (most of time 
even much more) without false positives (! means: no "spam" folder to check 
for users which doesn't save time at the end...) to any of our 
users/customers and provide such email gateways (like others), devloping and 
maintaining complex levels of anti abuse and anti spam stages in our systems. 
 So i think i know about what i'm talking herein.


>I have to use my ISP's smarthost to send mail through port 25. Is DNS
>resolution done on my end, or the ISP's?
In a full ("typical") smarthost client setup your client does only DNS to 
resolve  your smarthosts IP (except  you use a IP address to connect to it,  
but this may reduce SSL/TLS functionality).

cheerioh,


Niels.
-- 
Niels Dettenbach
Syndicat IT & Internet
http://www.syndicat.com