[SWLUG] smtp authentication

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On Tuesday 13 December 2011 07:49:41 Matt Willsher wrote:
> They may not be rewriting it.  It's just that your email address is
> coming from a server that hasn't been designated as a carrier for it.
> I think they're using DKIM (http://en.wikipedia.org/wiki/DKIM) which
> you can set up in your own domain. You might want to confirm this is
> the case before deciding what to do next.
well since i originally posted i've been playing :) i decided to log on to 
vigin webmail to look for a setting of some sort and guess what i found: 
bleedin' googlemail is virgin webmail, and it is a feature of googlemail that 
all from addresses are rewritten unless you specifically add the different from 
address to a list for that acount.  it seems that by using smtp.ntlworld.com 
as neil does - and as i've always done - the message gets sent unchanged, but 
the server does not seem to support authentication, but when i used 
smtp.virginmedia.com (or smtp.virgin.net) i was ablt to authenticate but then 
the mail got rewritten
my guess is that smtp.ntlworld.com is old enough to have nothing to do with 
google and the others are all google'ified, it isn't possible to even add a 
domain name with a wild card before it as a permitted from address -  and i 
have more than one domain name!
what i don't understand is how yahoo know that i've authenticated to the 
virgin server in the first place, i can't see anything in the headers (which 
can of course be forged) to indicate this. so perhaps it is a DKIM thing for 
the from address and not authentication to the mail relay that yahoo really 
care about, since my isp is virgin i don't have another smtp server i can use 
authentication with to test this,
as it is this justifies my having my own postfix server all along, since virgin 
are apparently slowly moving towards forcing authentication for everyone 
sending mail and i'm always using a different email address for different sites 
i'll try to set up a transport in postfix just for the odd email address that 
fails, in this case to use gmail and authenticate for the freecycle group 
address since it just so happens that my freecycle group address is a gmail 
one! :)
i'm not one to consider google a deliberate conspiracy to take over the world 
or anything, but i would like to have a situation where all my mail wasn't 
sent via a worldwide organisation with issues about retention and ultimately 
subject to the us patriot act and similar, which with virgin smtp 
authentication would seem to be the result - address rewriting aside!

bascule
-- 
"...in your face eternal confinement!"