Re: OT: Re: Recipient validation - WAS: Re: Moderated posts?

[Tanstaafl <tanstaafl@libertytrek.org>]

On 10/15/2014 3:13 PM, Miles Fidelman <mfidelman@meetinghouse.net> wrote:
> Tanstaafl wrote:
>> 1. email to invalid recipients should be rejected at the RCPT-TO stage,

> Easier said then done - at least when a server does relaying, but 
> clearly ideal when possible.

No, it is 100% easily done.

For servers under your control, you just do it. If you don't know how
and are unwilling or unable to learn how, then you have no business
running a mail server.

For servers not under your direct control, but for whom your server is
the official relay for final delivery (which means you need the current
list o valid recipients), you either require them to allow you to
perform recipient verification, or to provide you with a constantly up
to date list of valid recpients, or you don't act as their relay.

<snip>

> Generally agree with you in principle.  And that's certainly the 
> standards-compliant policy.
> 
> In practice.... I support a few dozen mailing lists - operational 
> necessity dictates dropping a lot of stuff silently.

Lists are different, and definitely fall into the category of 'best
effort, but no promises'...