Re: [Asrg] What are the IPs that sends mail for a domain?

Douglas Otis <dotis@mail-abuse.org> Wed, 17 June 2009 17:26 UTC

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Subject: Re: [Asrg] What are the IPs that sends mail for a domain?
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On Jun 16, 2009, at 6:55 PM, Lyndon Nerenberg wrote:

> On Tue, 2009-06-16 at 17:24 -0700, Douglas Otis wrote:
>> IMHO, all outbound MTAs should be required to return CVS records  
>> for their EHLO name and offer MX records for their inbound.
>
> Doug, are you sure that's what you meant to say? The sentence is a  
> bit ambiguous. Are you really saying any host that sends mail (is an  
> SMTP client) MUST also host an listed SMTP server?

You are right.  This should have been pubic MTAs, meaning those that  
send email using port 25 without authentication.  All other sources  
should be restricted in some fashion, perhaps by ACLs or  
authentications.

-Doug