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Re: master.debian.org randomly deferring mail



On Sat, Apr 05, 2003 at 02:49:12PM +0200, Emile van Bergen wrote:
> On Sat, Apr 05, 2003 at 02:11:17PM +0200, Josip Rodin wrote:
> 
> > To quote the documentation,
> > 
> > Exim insists on there being at least one verifyable address in one of the
> > "Sender:", "Reply-To:", or "From:" headers (which are checked in that order)
> > on all incoming SMTP messages. If one cannot be found, the message is
> > rejected, unless "headers_checks_fail" is unset, in which case a warning
> > entry is written to the reject log.
> 
> The big question is, what is a "verifyable address" in this context? As
> in 'domain must have MX or A record'? As in 'VRFY', i.e. primary MX's
> MTA must not reject? 
> 
> Of course, the whole concept of verifyable addresses is a bit flawed
> because it's too vague. A bitbucket or an address that will always
> bounce at the MDA stage is still "verifyable" by a lot of definitions.

Glancing at the exim code, it appears to connect to the MX and see if
it objects to a RCPT TO.

-- 
  .''`.  ** Debian GNU/Linux ** | Andrew Suffield
 : :' :  http://www.debian.org/ | Dept. of Computing,
 `. `'                          | Imperial College,
   `-             -><-          | London, UK

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