Open Relay Checker before Opening MTA

Alex Satrapa grail at
Mon Feb 11 11:06:13 EST 2002

On Monday, February 11, 2002, at 10:22 , Matthew Hawkins wrote:

> Note that the internet standard says you MUST accept mail to the null
> sender.  This is how bounces are sent.  BUT note that the null sender is
> ALWAYS the *envelope* sender, and NEVER the *message header* sender (the
> message header sender is usually changed to "MAILER-DAEMON" or sometimes
> "postmaster")

I take it this means something like:

FROM: postmaster at
From: MAILER_DAEMON <postmaster at>
To: Postmaster <postmaster at>

Is that what you're talking about?  (well... writing about I guess is 
the technically correct term)

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