Multiple copies of incoming messages sent to users (was) Postfix problem

[Alex Brown]

On Wed, 2003-05-21 at 07:03, Julian Field wrote:
> At 22:46 20/05/2003, you wrote:
> >Thanks for your reply Julian,
> >
> >Actually, it's not just one particular message that's being sent to each
> >user.  Any message that a user receives at any particular time will be
> >sent more than once.  I'm not sure of the exact number of times a user has
> >received a copy of the same message but I know it happens at least 5
> >times.  The users don't receive multiple copies all at once either.  I've
> >noticed this behavior over a 24 - 48 hour period.
> >
> >Please excuse my ignorance but I'm not sure what envelope addresses
> >are.  Are those the "To" and "From" fields?
>
> The "To" and "From" headers are just what someone chose to write into the
> message. They are not used for mail delivery at all. The envelope addresses
> are what actually count. Think of it as a real letter in an envelope. You
> can put "To: Santa Claus" on the piece of paper inside the envelope if you
> like. It's only the message the postman sees on the outside of the envelope
> that affects its delivery. On most messages these addresses are the same,
> but they don't have to be. The last action in mail delivery is for the
> envelope to be opened and chucked in the bin, leaving you looking at the
> letter.
>
> Can you try the attached "Postfix.pm" to see if it helps please?
>

Hi Julian,

It looks like the problem was with my Cisco PIX firewall.  I'm not
exactly sure yet but I'll know more tomorrow.  I'm running the software
version that supposedly fixed the "fixup protocol smtp 25" bug but
apparently something is still amiss in that version.  I found that the
problem was not specific to MailScanner or Postfix.  I was experiencing
the same issue when using Sendmail and also when using a Lotus Notes
SMTP server.  I did apply that attached "Postfix.pm" and it didn't cause
any problems.

Thanks again for all your help and please keep up the tremendous work
you are doing for us.

Alex