I have a general query regarding Postfix and redirection of mail out of
my box.
I can send & receive email OK but I had a firewall problem when sending
mail to my ISP's smtp server.
With the old client based system (ie netscape sending / receiving mail
directly from the ISP) all I had to do was specify an SMTP server to use
for outbound mail.
Now I specify my own local SMTP (postfix) server. When it goes to send
mail, it uses different MX entries to route the mail to. This meant I
had to open up the firewall to SMTP on all IP addresses - which has to
be a bad thing.
Two questions:
a) Why do I see different SMTP servers used when sending mail
(smtp-01.myisp, smtp-06.myisp .... ) ?
b) Is it possible to tell postfix to use the same server (prev
mail.my_isp.net.au) ?
(I tried setting relayhost in main.cf but that did nothing)
Regards,
Andrew E
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