Postfix as internal relay to ISP's mailserver

I want to setup Postfix on a LAN to relay outgoing mail to the ISP's
mailserver. Is this possible?

zaphod

"zaphod" <none@none.com> wrote in message
news:45113d7e$0$3593$ed2e19e4@ptn-nntp-reader04.plus.net...
> I want to setup Postfix on a LAN to relay outgoing mail to the ISP's
> mailserver. Is this possible?

Yes, this is possible.

I have postfix set up on an internal machine to add a BCC to an archive
mailbox and relay the message.

relayhost = smtp.modomain.com

zaphod wrote:
> I want to setup Postfix on a LAN to relay outgoing mail to the ISP's
> mailserver. Is this possible?

As Steve mentioned, sure, Postfix can do it. But success depends
largely on how your particular ISP operates, and whether you have
a static or dynamic connection.

For example, some of the things I've run across before:

* Some ISP mail relays won't accept your email unless your system
IP address is on their network (like when you dial up).

* Some will force the FROM address to be your ISP account address, so
that you can't send email with other FROM addresses.

* Some require SMTP AUTH login, and also TLS encryption on the SMTP
ports.

* With dynamic IP addresses, some mail servers require POP-BEFORE-SMTP
to authorize your IP address.

However, if your ISP doesn't satisfy your needs, there are inexpensive
commercial mail relay offerings out there. (Note also that some ISPs block
the SMTP port 25 to anywhere but their mail relay).

--
Greg