From: /dev/rob0 (rob0gmx.co.uk)
Date: Tue Mar 09 2004 - 20:15:28 CST

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On Tuesday 09 March 2004 12:21, axa_gmx.net wrote:
> If I cannot have multiple "relayhost's" in main.cf, can you please
> tell me, what is solution to the problem that I described in my first
> mail?

In general you do not need a solution, That is, it should not be a
problem. You can relay through the ISP using any envelope sender
address. (See mutt's envelope_from option!)

I think some places are filtering such mail as spam, though: verifying
that the mail is coming from a mail exchanger for the envelope sender's
domain. I don't know how widespread this is yet, but since it's very
common and will reject tons of non-spam (such as almost every mail I
send!) I don't think it will catch on.

> Should I define these SMPT relay hosts in transport maps, and then in

Since you apparently can't do a per-sender transport, no.

> /etc/postfix/transport something like the following: # to send all my

That file exists and has syntax examples.

> mydestination = darkstar.example.net, localhost.example.net,
> localhost.localdomain, darkstar, darkstar.localdomain, localhost
>
> Sorry, if I'm asking some too simple (and perhaps, annoying)
> questions. I'm new in using postfix.

I've been there. I didn't post questions, but I did have quite a time
trying to get the "big picture" of how email works. No, not talking
about the postfix "big picture" which is documented; I mean the overall
view of how email moves from place to place, what the various protocols
do, and how they relate to one another (if at all.)

I started out like you, just me and on a dialup account. This was
shortly before RBL's like MAPS DUL caught on, and I was able to send
some mail directly from my dialup to remote mail exchangers. Now that
is no longer feasible, since almost every significant mail site uses
the RBL's.

One thing I would highly recommend to you is that you get a personal
domain name or dynamic DNS hostname. Dynamic DNS providers come and go,
but if you have your own domain name you can get free DDNS service from
a DNS provider like zoneedit.com. DDNS updating would be as simple as
putting a wget command in your /etc/ppp/ip-up script.

Zoneedit will also give you free mail forwarding to a specific account:
all mail for ${ANYONE}$YOUR_DOMAIN goes to that account. What a deal!
Then fetchmail and procmail can slice and dice and shred and make sure
each message goes to the proper place.

You don't want to pay for a domain name? http://www.eu.org/

No place to park a domain, or you don't want to pay for hosting?
http://www.uucpssh.org/ looks interesting.

Eventually you can achieve full control over your own mail. That's a
goal I recently reached. I knew it was necessary as I started to
understand the problems I was having with ISP and free email providers'
addresses.

Good luck and have fun with it.
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