Hi,
I have set up postfix as a gateway mail relay on a linux box at our office.
This gateway only connect to the internet during office hours and has no DNS
record anywhere. Initially I configure it to send mail directly to the
internet without using any intermediate host. It's work fine for most of our
client's mail servers. However, some of them refuse our mail because it
can't find reverse DNS records of our mail gateway. So I have to use
relayhost for these client's (using transport_maps). I used to use 'MDaemon'
mail server on W2K machine, it has a nice option saying that 'delivery
undelivered mail to this host if it can't directly send for any reason'.
This option is best suite for our need cause we try to avoid intermediate
host usage but if we can't avoid it then use it as need but not being used
it for all.
My question is, is there a way to do this in postfix? As I can see, when
remote server say '533 invalid sender' postfix simply bounce the message. I
think it will be nice if secondary relayhost come in to play in this
situation.
Many thanks in advance,
Saran
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