[TriLUG] 550 mail error

Tanner Lovelace clubjuggler at gmail.com
Fri Jan 12 22:48:42 EST 2007


Historically, you used to be able to send an e-mail address
and specify the path it went by replacing the @ sign with a %
and appending the server you wanted it to go through.
This was useful in reaching bitnet addresses because
there were only a few bitnet gateways.

So, if you had an address like lovelace at bitnet and wanted
it to go through the bitnet gateway at nyu.edu you'd format
the address like this:

lovelace%bitnet at nyu.edu

Once it got to nyu.edu, they'd take "lovelace%bitnet",
rewrite it to be "lovelace at bitnet" and send it to the bitnet
network.

However, since bitnet and other fringe networks have
pretty much gone away and everything is connected,
this hack is pretty much died out and, in fact, I would
probably consider any MTA implementing it a security
risk.

Cheers,
Tanner

On 1/12/07, Matt Frye <mattfrye at gmail.com> wrote:
> I'm getting "550 Forwarding percent hack is not permitted" and not
> finding much documentation about this error.  It occurs when I send an
> email to an account I know exists from another valid account, but
> don't get the message when I send from a different account to the same
> domain (different user).  From what I know of the receiving
> organization, it could be someone trying to configure something and
> not getting it quite right.  Anyone have experience with this error?
>
> --
> Matt Frye
> http://www.linkedin.com/in/mattfrye
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-- 
Tanner Lovelace
clubjuggler at gmail dot com
http://wtl.wayfarer.org/
(fieldless) In fess two roundels in pale, a billet fesswise and an
increscent, all sable.



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