Open Relay Checker before Opening MTA

[Peter Barker]

On Mon, 11 Feb 2002, Matthew Hawkins wrote:

> Remind me never to get you to write me an SMTP MTA :P
> 
> A real bounce will look like so (RFC1894):
> 
> --------------
> EHLO mail.example.com
> MAIL FROM: <>

            ^ oops.

No spaces allowed here. Everyone accepts them, though..... liberal in what
you accept, blahdiblahdi blah....

I haven't looked at the more recent RFCs (the ones which obsolete 821 and
822 (2821 and 2822?), so things may have changed.

Additionally, RFC821 appears to be internally inconsistent about allowing
the above address. Whilst it specifically allowed the null address (MAIL
FROM:<>), the EBNF grammar does not permit it....

Yours,
-- 
Peter Barker                          |   N    _--_|\ /---- Barham, Vic 
Programmer,Sysadmin,Geek              | W + E /     /\                
pbarker at barker.dropbear.id.au         |   S   \_,--?_*<-- Canberra      
You need a bigger hammer.             |             v    [35S, 149E]   
qq%I've never heard of it or used it, apart from finding it in the Camel
 book and saying "Oh god".% -- Onceler